Alexei Volkov
The bridge of a guitar plays a crucial role in setting the placement of the strings, tone, action, and intonation. Over time, the bridge of a guitar can get damaged, warped, or fall off due to temperature, humidity, or heavy use. If the bridge has popped off by itself and is not damaged, it can be glued back into place. However, if the bridge is cracked or warped, it needs to be replaced. This involves removing the old bridge, cleaning the surface, and gluing a new bridge into place. The process of replacing a plastic bridge on a guitar can be done at home or by a skilled repairperson and involves specific tools and techniques to ensure a proper repair.
How to Replace a Plastic Bridge on a Guitar
| Characteristics | Values |
|---|---|
| Reasons for replacement | Temperature, humidity, heavy use, damage, warping, loosening |
| Bridge type | Plastic |
| Tools required | Bowl of water, rags, screwdriver, C-clamp, card stock paper, chisel, microfiber cloth, glue (Titebond III wood glue, aliphatic resin, hide glue) |
| Steps | 1. Loosen and remove strings 2. Remove bridge pins 3. Scrape off excess glue with a chisel 4. Wipe surface with a microfiber cloth 5. Sand the back of the bridge 6. Trace the bridge outline on card stock paper 7. Place the paper cutout on the guitar to protect the finish 8. Perform a "dry run" by clamping the new bridge in place 9. Apply glue to the back of the new bridge 10. Clamp the glued bridge in place |
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What You'll Learn
Removing the strings and bridge pins
To remove the strings and bridge pins from your guitar, you will need a few tools. These include a pair of pliers, string snips, a string winder (with a built-in bridge pin puller), and some fresh guitar strings. You may also need a coin or a small block of wood. It is important to work on a stable surface, so place your guitar on a towel to prevent scratches.
First, unwind and remove the strings from your guitar. Turn each tuning peg clockwise on the guitar neck to loosen the attached string. Once the string is loose, unwind it from the peg. Then, follow the string down to where it connects to the bridge with a bridge pin. Push the string slightly towards the pin to loosen it, and then pull the pin straight out.
If your bridge pin is stuck, try pushing down on the string under the pin. Sometimes, the ball end of the string gets wedged between the pin and the bridge plate. If you can un-wedge the string, the bridge pin will lift right out. If this does not work, try pushing the pin up from inside the guitar. To do this, you will need to loosen or remove the other strings so you can fit your hand inside the guitar.
If the pin is still stuck, you can try to wiggle and push it up from underneath with your fingers. If this does not work, try using a coin or a small block of wood to gently pop the pin up from inside the guitar. Be careful not to use too much force, as you do not want to damage the pin or the bridge.
If you are still unable to remove the bridge pin, you can try using tools such as a string winder with a bridge pin grabber, wire cutters, or needle-nose pliers. Fit the bridge pin puller around the head of the bridge pin, and then turn the string winder so that the open side of the slot is facing the strings and fingerboard of the guitar. Slide the slot at the end of the string winder into the throat of the bridge pin to secure the head. Finally, press back against the bridge to gently pop the pin out.
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Scraping off excess glue
When replacing a guitar bridge, it is important to scrape off any excess glue from the guitar body. This can be done with a chisel, but it is important to be careful not to dig into the guitar finish or slip with the chisel. Gently scrape the surface where the bridge was previously glued to get rid of the residue. Afterward, wipe the surface with a microfiber cloth to remove any remaining glue bits.
If the glue is on the veneer, the process becomes more complicated. Using excessive heat to dissolve and wipe the glue away is not recommended, as it could affect the glue on the underside of the veneer or cause the veneer to dry out and crack. Instead, try using a combination of heat and moisture. Start by lightly dampening a clean rag with warm water and try to wipe the excess glue away. If this doesn't work, try applying gentle heat with a hairdryer and attempt to remove the glue again.
Another method is to use a heat gun, hair dryer, or steam iron to apply heat to the veneer while also using a small amount of moisture to prevent the veneer from drying out and cracking. Be careful not to use too much moisture, as this can cause the veneer to bubble. After removing the excess glue, use a sharp blade to cut a small slit into the affected area. Inject a small amount of PVA glue into the slit and spread it evenly with a small paintbrush. Place a weight on the area, ensuring it doesn't stick to the guitar body, and let it sit for 24 hours or as recommended by the manufacturer.
It is important to remove excess glue before applying a new bridge, as it can prevent the new bridge from adhering properly to the guitar body. A visual inspection may help determine if most of the glue has been removed, but it is often difficult to see. One method is to dampen the body and check if moisture is pooling around the area, as glue prevents moisture from absorbing into the timber. Once the glue is removed, wipe a damp rag over the timber to check your work.
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Sanding the guitar body
Choose the Right Sandpaper
Select a suitable sandpaper grit for the task. Start with a finer grit, such as 600, to remove any minor scratches or imperfections. Then, gradually move to higher grits like 800 and 1500, removing the scratches left by the previous grit. Each finer grit sandpaper will help eliminate the marks from the previous step, creating a smoother surface.
Prepare Your Work Area
Ensure your work area is clear and well-protected. Place your guitar on a flat, stable surface, preferably on a carpet or cardboard to prevent scratches. Gather your tools, including the sanding block and sandpaper, and have a bowl of water and rags nearby for cleaning.
Sanding Technique
Always use a sanding block when sanding the flat surfaces of your guitar. Wrap the sandpaper around the block, ensuring a tight fit. Start sanding the guitar body using circular motions and very light pressure. Work in small areas at a time, pretending you're applying sunscreen to your arm. Always sand with the direction of the grain, never against it. Sand in one direction on the edges, as the grain will run in a different direction.
Remove Residue and Blemishes
If there is any old glue or residue from the previous bridge, gently sand the area to remove it. Use light pressure and work until the residue is gone, being careful not to dig into the guitar's finish. You can also use a chisel to carefully scrape off any excess glue before sanding, but be cautious not to damage the guitar's surface.
Clean and Inspect
Frequently clean the sandpaper during the process. Replace the sandpaper once it becomes clogged with grit or residue. Look for \"loading\" or blobs on the paper and remove them immediately, as they can leave deep scratches. Once you're satisfied that all imperfections and residue have been removed, wipe down the guitar body with a damp rag to remove any loose grains and dust.
Remember, correct preparation is crucial for achieving a high-quality finish. Take your time, be patient, and ensure your guitar body is smooth and ready for the new bridge installation.
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Gluing the new bridge
If your guitar bridge is loose or cracked, you will need to remove it from the body and reglue it or replace it. Before gluing the new bridge, it is important to do a ""dry run" to make sure everything is in the right place. Position the new bridge and clamp it in place. Once you are satisfied with the positioning, remove the clamp and the new bridge.
Prepare your workspace by setting up a bowl of water, some rags, and a screwdriver. It is also important to prepare the surface of the guitar by removing any finish under the bridge. This will allow you to secure the bridge properly using woodworking glues. You can use aliphatic resin or hide glue, or Titebond III wood glue, as recommended by one source.
Now, you can begin the gluing process. Apply a thin layer of glue generously over the entire back of the bridge. Then, place the bridge back in the correct position and clamp it in place. Wipe off any excess glue with a damp rag. Allow the glue to set for at least two days.
Once the glue has dried, you can release the clamp and check that the bridge is secure. If done correctly, your guitar will not only look great, but it will also create better high-end, sustain, and response.
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Clamping the new bridge
Before clamping the new bridge, it is important to prepare the guitar's surface. Use a chisel to gently scrape away any excess glue or residue left from the previous bridge. Be cautious to avoid digging into the guitar's finish. Wipe the surface clean with a microfiber cloth to ensure no glue bits remain. This step is essential for ensuring the new bridge adheres properly.
Now, you will perform a "dry run" to ensure the new bridge is positioned correctly. Line up the new bridge with the traced outline of the original bridge. Use a deep C-clamp to securely hold the new bridge in place. Position the C-clamp in the guitar's center hole to ensure stability. Check the bridge's positioning with a straightedge and a level if you want to be extra precise. Once you are satisfied with the alignment, release the C-clamp and remove the new bridge.
Before final installation, apply a thin layer of wood glue to the backside of the replacement bridge. Choose a quality woodworking glue such as aliphatic resin or hide glue, which are known for their ability to transmit kinetic energy effectively. You can also use Titebond III wood glue, which has proven effective for guitar bridge repairs.
Finally, it's time to clamp the new bridge in place permanently. Position the new bridge according to the traced outline and use the C-clamp to hold it securely. Ensure the guitar is protected by covering the top with a plastic sheet and surrounding the bridge with masking tape to avoid scratches. Let the glue set for at least two days before removing the clamp and testing your guitar's new bridge.
By following these steps, you will ensure that the new bridge is clamped securely and accurately, leading to a successful guitar bridge replacement.
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Frequently asked questions
If there is a gap between the bridge and the body of the guitar, it has come loose. Sometimes the gap is very small, so use a piece of paper to check. If the paper slides between the bridge and the body, the bridge is loose.
First, unwind and remove the 6 strings from your guitar. Then, reach inside the soundhole and loosen the screws to remove the bridge.
Buy a replacement bridge that is similar in size and shape to the original. Before gluing, do a ""dry run" by clamping the new bridge in place to make sure everything is correct. Then, apply a thin layer of wood glue to the back of the new bridge, line it up with the traced outline of the old bridge, and clamp it in place.
Use quality woodworking glues such as aliphatic resin or hide glue, which have the ability to transmit kinetic energy through the glue joint.
