Schallar Grand Tune
Love them. I have two Martin Custom shop guitars that came with cheap Martin open back tuners (Grover). (D-28 Cocobolo Adirondack Hide Glue, and Om-28 Guatemalan Rosewood, VTS Adirondack top, 2 of the best guitars I've ever owned). I opted for these because they are being used on Custom shop guitars and IMHO are smoother and easier to turn than Waverly tuners.
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