I just found an article complete with photographs on this very problem. San Francisco Chapter newsletter http://www.ptg.org/newsletters/941/2008/03.pdf starting on the front page "The Sounding Board" column. Scott J Paul Mulik wrote: > I went back to tune it today, and now one of the flange screws for the damper lift tray has fallen completely out, and the others are also quite loose. I guess I probably noticed this the first time but couldn't figure out how to tighten them. I really can't remember at this point.
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