Paul The idea behind this set up is to adjust the cap nut up to where it is supposed to be. (Snug against the trap). Then, while holding the cap nut with a pair of channel locks, tighten the other nut with a crescent wrench until the two are tight. If they are tight, they will stay. I've had to adjust some where I could just barely undo them. So it does work. Wim -----Original Message----- From: Paul Milesi <paul at pmpiano.com> To: PTG Pianotech List <pianotech at ptg.org>; my.ptg Pianotech <ptg_pianotechne at egroups.ptg.org> Sent: Fri, Jan 20, 2012 8:10 pm Subject: [pianotech] Pedal Rod Adjustable End Nuts, Lock Nuts & Washers I occasionally run into adjustable pedal rods where the lock nut doesn't really accomplish it's intended task. That is, even with the lock nut securely tightened against the adjustable nut end, with or without a metal lock washer or leather washer, the whole assembly still turns freely and works its way down the pedal rod, introducing lost motion. Can someone explain the principle involved with the lock nut & washer, how they're supposed to hold the adjustable end in place, if everything is threaded the same? How is it that, like a Yamaha I worked on today, they often turn in tandem and very freely, even when tightened together? How is a leather or metal washer supposed to help? Sorry, but I'm just not getting this mechanically. Also wondering if there is a "fix" for the problem? Paul Milesi RPT Washington DC (202) 246-3136 Cell/Text paul at pmpiano.com http://www.pmpiano.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120121/d8201de6/attachment.htm>
This PTG archive page provided courtesy of Moy Piano Service, LLC