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Calling all Hammer heads
We are currently doing a new Custom Balanced action on A late 60's
Steinway B.
As we are taking the measurements of the Sting heights & center pin
heights to determine a new hammer bore dimensions I notice that the old teflon
center pin height is approx 2 mm lower than the new center pin height of the
Renner shanks & flanges. I said Hmmm.... interesting. We don't do many newer
teflon type actions but there are some consideration to think about.
1. A new center pin height does change the bore dimension & the action
spread some. What effect that will have I haven't calculated completely yet but,
2.. Since the original hammers were bored IMO short a higher center pin
height means even a shorter hammer bore. TOOOO short. Original bore was 2 &
1/16 " bass & 1 /3/4" tenor/treble. Usually ina a B I'd expect at least 2 &1/8"
bass . 1 & 13/16th" tenor treble. Or 54 mm bass & 47mm trebles
3 So in order to retain a more normal bore distance the solution seems to
be lowering the entire stack/center pin height. The wippen center is also
higher than the nominal 3 & 1/4" from the keybed as quoted by Steinway for the
height so that will go down as well it seems
I don't see any problem lowering the stack unless it changes the magic
line of wippen center to bottom of balance pin intersection of the capstan at
half travel radically.
Any body else notice this stuff or have any relevant & helpful
feedback...warnings? Should be fun. I'm installing a beautiful Set of Ronsen Wurzen
hammer heads.
Dale Erwin
Erwins Pianos Restorations
4721 Parker Rd.
Modesto, Ca 95357
209-577-8397
Rebuilt Steinway , Mason &Hamlin Sales
www.Erwinspiano.com
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