---------------------- multipart/alternative attachment 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 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/f0/e1/89/79/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC