Yamaha double strike

[duse1]

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While working at PianoDisc we installed on many
Korean up-rights.We had this problem on some and
it was in a certain production period. Are problem
was track down to Key frame position.Measure the=20
capstan position to the string. We also had a
production change in the shape of the hammer butt
You may look at that. Yamaha tech support may help
also Good luck
                       Don

Donald Dusenbury
7070 Pearl Rd.
Middleburg Hts.44130
440-884-2886
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