Brian's Guitar from Conception to Birth or How to Build a Guitar in 62 Easy Steps!
32 Drill for the Tuners
Earlier you drilled some small, shallow pilot holes to establish the tuner locations. If you didn’t do it then, overlay your headstock template and do it now. Chuck up your drill press with a bit sized for the turners. I prefer the cleaner cut of a forstner bit. Test the setup on some scrap first to make sure everything will fit correctly. Tape off the back of the headstock and clamp it down over a piece of scrap to avoid tear out when the big bit breaks through the back. Tuners which are out of line are very noticeable, so take your time to line up the locations dead on.
 
Our tuners had little alignment pegs you had to drill for as well. These keep the tuner housing from spinning around when you install the tuners. Make some layout lines through the centers of the holes you just made. Carefully measure the distance from the edge of the hole (not the center) to the center of the peg. Carefully (I used that word again) transfer your measurements to the back of the headstock and indent the location with an awl. Chuck up the drill press with a bit sized for the alignment pegs. Set your depth stop for the appropriate depth. Test the setup on some scrap first to make sure your measurements and layout were precise. Drill for the alignment pegs.
 
Now install all of the tuners. If the hole is a little snug, ream it out a little with a round file. Tighten them by hand; it’s not necessary to torque them down too hard. On a tight headstock like ours, careful preparation and design work ensured that the tuners wouldn’t interfere with each other. Now stand back and admire your work, then take all the tuners back out. You need to install and check all of the hardware before you apply your finish since it would be impossible to tweak something successfully afterwards.

Store the tuners back in their original packaging (or in small plastic containers, or in baby food jars, or in whatever) to protect them and to keep all the nuts and washers together in one spot while not mixing them in with all the other hardware. If you think you’ll get confused you can also add some labels in the containers to identify what screws go to what.

 

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