Hi Paul, I've heard both arguments "this way and the jack slips out better" and "that way and it gets returns better, especially on a soft blow". In a class I took years ago (can't remember who but he was good, and it made sense) he said his company did a lot of testing and it didn't seem to matter, but that they all should be the same. That being said, I just looked at some new Renner knuckles and they are installed so that the jack goes OUT with the grain and returns AGAINST the grain. To me this is counterintuitive. I looked at another piano and they were backwards from that. Go figure. I bet Mannino has an opinion because those guys are testing fanatics! Jim -----Original Message----- From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Dempsey Jr., Paul E Sent: Tuesday, June 01, 2010 1:58 PM To: pianotech at ptg.org Cc: caut at ptg.org Subject: [CAUT] Knuckle Direction OK, maybe just too much week-end or perhaps old-timers.... I am re-knuckle-ing a set of grand shanks. The new parts are of Able manufacture and have a pencil line on each. Does this line face the flange or the hammer? I know the line indicates the direction of the nap of the leather, but which way is preferable. Paul E. Dempsey, RPT Piano Technician Sr. Marshall University Huntington, WV 304-696-5418 304-617-1149
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