I wasn't happy with the appearance of the tuners on my GK Pro and tried swapping out just the knobs, but wasn't fully satisfied.
Did a lot of research on the Delcamp forum on tuner recommendations and Rubner's were always pretty high on the list of good affordable reliable tuners.
Note; I was stunned to discover that there are tuners out there that will cost you almost as much as a guitar would.
I contacted Chuck at Allstringsnylon. We spent quite a bit of time talking on the phone about tuning machines and appearance. Chuck's a great guy to deal with!
I finally settled on these for my GK Pro.
https://allstringsnylon.com/rubner-t...ic-150-300a-co
I paid my local luthier $50 to remove the old ones and install them. Couldn't be happier!!