Sometimes when you send samples they add a few mm's to compensate for estimated wear. Sometimes they get it wrong. Better to measure and send specific dimensions. A little tricky to redrill an entire set when the hammers are tapered and tailed but it can be done. You will need a boring jig. Take them off, plug them with dowels and proceed slowly and carefully. David Love davidlovepianos at comcast.net www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Cal Munson Sent: Tuesday, October 23, 2007 7:03 PM To: pianotech at ptg.org Subject: Hammer bore distance update Thanks List for your responses. The piano is a Steinway A and the bore distance, I am told should be 46 mm My own 'A' has an ideal bore distance of roughly 44 with some sections at 44.5 and others at 43.5 The hammers in question, Renner Blues, have been drilled with a bore distance of 49 mm (center of hole to striking surface of hammer) so they are 5 mm off. The old hammers with shanks were sent as samples so it is a mystery........ However, I don't see a downside to having the hole filled and then re-drilling. But I have not done it before... Anyone? Cal Munson
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