Yamaha GP hammers

[Mark Wisner]

Yamaha has pre-hung hammers for almost all the grand pianos with metal hammer rails.  The exceptions are the pianos with a 29 note bass section,  (G1A, G1B, G1D, G2A, G2B and G2D).  Since the shank flanges for Yamahas with wood hammer rails are different from the metal hammer rail flanges, a metal rail, pre-hung set can't be used on a wood rail piano.  UNLESS the new, pre-hung set flanges are changed to the wood rail flanges taken off the old set.  The flange type is the only difference, the shanks, hammers and bore distances are identical.  While you do end up with old flanges on new shanks and hammers, (not the ideal, to be sure) it seems to work well as the flanges are pretty long-lived, and most of us techs can re-pin a set of flanges a lot faster than we can hang a set of hammers.  The only information we need is the number of bass notes and the bore distance of a hammer from both the bass section and the treble section.  BTW, Schaff stocks the full line of Yamaha hammers.  Hope this information helps.

Mark Wisner
Yamaha