This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment ----- Original Message -----=20 From: Mike Bratcher=20 To: Pianotech=20 Sent: December 18, 2003 8:11 PM Subject: Re: A Hitch in a Hitchpin/Del Are these the same type hitch pins used briefly by Baldwin in their = Classic series grands? I needed to twist a bass string on one of these = a while back, but was unable to get the string off after the round loop = of the bass string had elongated to the point it wasn't possible to = remove with out damaging the string. Mike Bratcher Well, yes and no. They are the right type but not the right = specification. This problem was noted with the original testing of this = pin. And it was solved, at least in theory. The standard pins have a rather deep groove either machined or rolled = into them. For the 3/16" (approx. 4.8 mm) pin this groove is 1/32" = radius X 1/32" deep (approx. 0.8 mm r X 0.8 mm d). For the 7/32" = (approx. 5.6 mm) pin this groove is 3/64" radius X 2.5/64" deep (approx. = 1.2 mm r X 1.0 mm d). For a small extra cost the companies making these = pins will make this groove any radius and depth you want. So we tried = some pins with a shallower groove and they worked great. There was no = problem with removing and replacing bass strings and they still located = the strings properly. Unfortunately, the extra cost of the pins = apparently precluded their use in production. The special groove did add = about 25% to their cost. This amounted to, perhaps, a dollar or so per = piano. The proper specification (for anyone interested) is (for both pins) a = groove diameter of 1/16" and a groove depth of 1/32" (or approx. a 1.6 = mm radius and a 0.8 mm depth).=20 Del ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/4b/3c/b5/0f/attachment.htm ---------------------- multipart/alternative attachment--
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