>A rather common problem around here is upright damper/sustain systems out o= f >whack, the familiar uneven rise of the line of dampers. After tightening al= l >relevant hardware (which doesn't usually help much) I regulate it. But I do= n't >quite understand why this develops or how to fairly simply solve it other t= han >by regulation. > >Removing the rods to see if they're warped might take quite a while; and if >they are, what then, just replace and regulate anyway? Is straightening one >of these rods practical? Or is the problem compression of the felt in the >mounting brackets, which doesn't seem like it could account for all the >out-of-lineness. > >Thanks >Robin Fox Robin, List, I don't believe anyone has mentioned my take on your real problem. These "...rather common...out of whack...damper/sustain systems..." do not develop, but rather have been around since the piano was manufactured. If a damper system *was* correctly regulated in the beginning and the parts were appropriately aligned at that time and off a reasonable quality, *then and only then,* do other factors like damper lever lift rods (one piece type) warping (not likely), the hanger hooks being bent (not likely except under maybe abuse situations or poor quality materials), the hanger hook hinges start to break (not always obvious), or are broken (very obvious), and irregular wear of the damper lever felt (highly unlikely, as the felts wear evenly) would be the areas of concern. Two piece damper lever lift rods have an area where they meet that can wear out, somewhat causing uneven lift over time. Sincerely, Keith A. McGavern kam544@ionet.net Registered Piano Technician Oklahoma Chapter 731 Piano Technicians Guild Oklahoma Baptist University Shawnee, Oklahoma, USA
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