Be Careful with the Screws
Those tiny screws on Vintage Tuners are an issue for lots of people...and have been for many years. The screws that come with the Gotoh tuners have the same issues. This seems to be a common issue with all manufacturers. But, the screws are so small that no tuner manufacturer seems to have found a better solution yet.
In most cases, the tiny screws will install easily if a couple of precautions are taken.
1.) Drill a pilot hole for each screw. Without a pilot hole, the wood may crack or the screw head will break off, or both!
2.) Apply bar soap or candle wax to the threads of the screws. This reduces friction.
3.) Use the correct size Philips screw driver, so that the screwdriver doesn't slip or damage the screw head.
4.) The screws should mount smoothly. If you feel resistance or binding or a lot of friction...STOP! Something is wrong.
These same four precautions should be used for every screw that gets put into guitar necks and bodies.
Cheap screws with these tuners are a disaster
These tuners are made in Japan, and so far they appear to be better than the original Kluson tuners. Unfortunately, I have to give the 6-tuner package a lower rating because of the mounting screws Warmoth supplies with the package. They are soft, cheap garbage...at least the ones I received were.
I carefully measured the required hole depth for the screws, drilled them on a drill press, and then counterbored the top of each hole to allow for the larger diameter of the unthreaded shank. Even using the greatest care, the very first screw broke inside the hole. What a nightmare!! I ended up drilling it out with a 1/4" titanium drill bit, and backfilling the 1/4" hole with a glued-in hardwood 1/4" dowel.
If you buy these tuners, do yourself a favor and DON'T USE THE CHEAP SCREWS that come with them. Go out and buy some good ones. Evidently Warmoth has a serious quality control problem with the screws they provide. They need to source some better quality screws for these tuners.