I didn't like the Klusons that came with my Gibson, thirty-six years ago, so I changed them for Grover Rotomatics, which are great. My new Martin came with opem back tuners that say "CF Martin" but look like Waverlys. Waverly makes the best tuners, in some peoples' opinions. They have a 16:1 turning ratio, while most others have 12:1.

If you go to frets.com, you will find some good articles about tuner maintenance.

EZR