George,
How common? Not very, the number found "in the wild" is so far in single digits. They all appear to be built from the same castings (per Don Williams) but are slightly different.
Piano makers only? So far. Seems that making piano "actions" (key to hammer) is possibly the last true woodworking craft passed from master to apprentice. There is more written about making harpsichords than pianos. BTW, harpsichords function completely differently than pianos.
It is a mystery why the wheels on their benches, expect some more information and speculation when Don finishes his book on Studley.
Personally, I like the idea of a wheel, but then I have many hours in on milling machines using handwheels to control the cutter.
Mike
George, the comment re: harpsichord function is meant for other readers who may not be aware - I expect you could give me chapter and verse on the differences (grin)
Last edited by mike holden; 09-19-2014 at 10:34 AM.
From the workshop under the staircase, Clinton Township, MI
Semper Audere!