Petrof Quality

[David C. Stanwood]

Dale Erwin writes:

>The problem is that the hammers were just way to heavy for example Note 16 
>was  10.5
>grams. That's  hammer wt. not strike weight.

Thanks Dale,

I've got lots of data on Petrofs and the consistent problem is a mismatch 
of hammer weight and ratio. (both too high for each other)

For those of you that have a hard time comprehending numbers, a 10.5 gram 
hammer is  1/4 into the high zone.

http://www.stanwoodpiano.com/SW-HWstandards3.pdf

David Stanwood