These fit in the original holes of a Gibson L6-S that I am bringing back to life. Great quality and Stew Mac's service was great as well.

Bought these to replace older, worn out tuners and the difference is night and day! By far an excellent set of tuners...

As the title of the review suggests, M6 180 tuning machines replaced the Grover Mini Rotomatics on my Gibson J-15 using the original alignment screw holes. The alignment isn’t exactly like the Grovers. Instead of the tuning knobs aligning across the head stock, they more closely match the head stock taper. Overall, tuning is smooth and stable like it’s supposed to be. One thing to note, I had to use a tapered reamer to remove some finish from the head stock holes so that the bushings would fit. The bushings are a definite upgrade over washers. The string winding posts do not move or rattle at all prior to stringing up the guitar.

5/5 these things are sharp

I had compare the measurements very carefully when choosing this set (because of the narrow snake-head stock). It is extremely handy to have design dimensions on the web page. These fit perfectly and provide very stable tuning.

These tuners have slightly different specs than M6 tuners of years past. They didn’t fit on my guitar

I love Schaller machines. They are always consistent in quality and pretty much the only brand I trust.

I am enjoying using the tuners and my guitar stays in tune very well.

I have an 1979 Guild Acoustic guitar that had Guild (Schaller) machines on it. I replaced those tuners with these gold Schaller machines and it was an almost exact replacement. I had to slightly open up the Headstock tuner holes to accommodate the tuner shaft bushing. I did this by using a round file to ever so slightly increase the hole diameter. Schaller's are made in Germany and are very nice tuners.. I have also used Waverly, Gotoh and Grover tuners.. They are ALL very good tuners.

40 year old Guild dreadnaught Brazilian rosewood - wanted to use Gotoh, but reconsidered when couldn't find gold with ebony knobs - old ones were getting a little sticky
1. Schaller fit perfectly
2. these area 18:1 replaced 12:1
3. a little smaller than the old ones, but just have small finish line exposed
4. no need to drill mouinting screw hole as new ones fit old mounting screw hole exactly
5. post hole needed to be reamed (use a real reamer) because old post had two different thicknesses - new ones have a top nut the goes INTO the hole so hole muist be all one thickness -- ream it out and then file to exact size - (see stew mac videos and youtube videos also)
6. replaced chrome with gold with ebony knobs (see pic below)