This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment >>I use an external tooth lockwasher under the plate. The reason: I don't want the hanger bolt to turn in the rim when I tighten the nut on top. Carl Meyer PTG assoc<< Wouldn't such a washer also tend to prevent the locknut below from turning when the hanger bolt is raised? If the hanger bolt is backed out to raise the plate, but the nut below doesn't turn with the bolt, then the plate remains stationary. Although I don't have any personal experience with the system yet, it seems like you are trying to prevent an inconsequential problem. If it the acorn nut tightens sufficiently within a reasonable amount of turns after contacting the plate, that alone is evidence that bolt is not turning significantly. If you can't tighten the acorn nut, then maybe there is a problem. Dean ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/ab/70/63/62/attachment.htm ---------------------- multipart/alternative attachment--
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