If you’re replacing the old tuners on your guitar and you find that the footprint of the new tuners doesn’t line up with the footprint of the old tuners, sometimes you need to fill those holes. Basically, there’s three things you can do: 1) nothing, and that’s fine if the old hole is going to be under the footprint of the new tuner. 2) fill the hole with a toothpick. Still, you want to do that if it’s going to be under the footprint of the new tuner or if the old hole is too big for the new screw to grab. You need to fill that void and a toothpick works well for that. The third thing you can do is, if the hole is outside of the footprint of the new tuners, then you want to fill it and you want to make it as invisible as possible. Here’s how you do it. So to replace the tuners, gently remove the old tuners and check the alignment of the screw holes of the new tuner. I noticed that none of the holes match up and there’s one that’s going to be outside the footprint here and is going to be visible. So for the ones that are under the footprint you can just take a toothpick, break it off, add a little ca glue or other type of glue in there and that will fill the void for you. For the hole that’s going to be outside of the footprint of the new tuners you can just take a piece of wood that’s the same species of wood as your neck would, either mahogany or Spanish cedar in my case, and just put it into a pencil sharpener and use that to fill the void. Now, for the glue I like to use either yellow glue or white glue. I find that if I use a ca glue, it has a tendency to darken this wood, especially if it’s end grain. So I like to use either yellow or white glue. I also like to use a portion of the wood that is either face grain or edge grain instead of end grain because the end grain has a tendency to darken as well. So just sharpen the end of it and glue it in place. Once the glue dries you can very carefully trim that flush with the peg head using either a saw or some nippers. If you need to you can also chisel it flush very carefully with the chisel. I then use a small amount of shellac or even lacquer to place on the patch to even out the color. You can now install the new tuners just like you would normally.