The Schallers Warmoth is talking about drilling for are the "Mini-Lockers", which may be different from what you have. I use Schallers almost exclusively these days, and Warmoth's holes are perfect. The tuner is tight to the point where you can't quite push them through until the tuner body is flush to the back of the headstock. You have to either draw them the rest of the way down using the threaded ferrules that hold them in place, or perhaps using a clamp to squeeze them down in. But, that's how you want your tuners to mount - tight. Otherwise, they'll tend to absorb string vibrations, which has a slight deadening effect.