For what it's worth.... I prepped an 1876 New York Model C at Steinway Hall. The piano had new bridge caps and pinblock, but I believe it had a shimmed board....can't remember, should have taken notes. We had many difficulties, mostly with bearing problems in the melodic and treble sections. Too much bearing in high treble, not enough in melodic section. This is not a criticism of the restoration department, just that they probably had challenges adapting a remanufacturing technique intended for more common models to a much older and more unique instrument. In addition, there was a lot of v-bar noise in the melodic section which could not be completely remedied. Both of these issues caused voicing problems. Eventually we got the piano playable after a lot of regulation experimentation, finally got it stable and at pitch, and to an acceptable level of voicing. It was never going to be a performance instrument, and would be sold to a collector....but a week or so of work yielded some limited results and was interesting in terms of problem-solving. We didn't experiment with pitch though, that might have helped. There were newer, heavier hammers used (NY Model D hammers). Original keys, original action brackets, new action rails, original keyframe. There was another major problem of inaccuracy of original capstan placement, and original key-leading inconsistencies....which led to a very heavy action, 70+ downweight. In addition, NY IMP parts were used, which don't regulate as well as the Pre-84 parts in this geometry....but we made it work. Keydip was 420+, probably 430, I think I resorted to chucking the dip block and doing it all by feel after much gnashing of teeth and cursing. I suppose the question would be, is it worthwhile and will there be a return on the investment? I wonder what the market is for these. Would it in fact be worth $100,000 when completed? If the customer wants to keep the piano and have a performance instrument, that may be impossible without major structural and action work. You might consider replacing the entire action, keys, keyframe, and damper system. It would cost more in parts but you would have more consistency and predictability. If you can adapt a D action that could be a viable option. Combined with rescaling and re-setting downbearing, new bridge caps, pinblock etc., the piano could be transformed. Costing for this would easily be in the $20,000 to $25,000+ range. But if they want it preserved for some reason, than that will take a lot more work. Another idea is to order hammers from Abel, they will custom-manufacture old-style hammers from samples. Boaz Kirschenbaum RPT Greenwich, NSW
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