First thoughts that come to mind: slick backchecks slick tails (are they checkered?) heavy hammers necessitating overly strong springs arc of tail On one set which had this problem, I lightened the hammers and was able to reduce the rep. spring tension and the problem disappeared. Jon Page At 05:54 AM 6/12/98 -0500, you wrote: >Dear list, > >I am stumped with the backchecks on this piano. The piano is an early 80s >S&S L with new Premium blue hammers on Renner shanks & flanges and >re-leathered original backchecks. I have CLOSELY regulated key height, dip, >let-off and drop, spring tension, and all the other usual suspects. The >problem is that the hammers absolutely refuse to check when the note is >played at the level of forte or less. They just bounce between the >backcheck and the string. The angle of the backchecks is good and they >check high enough, but I just can't seem to get them to work in the piano. >The problem is particularly bad in the bass and tenor, where the hammers >are larger. > >The problem may be in the balancier. When I push the balanciers down, there >seems to be much more spring resistance than normal although the hammer >rise is not particularly fast. The original wippens have been rebuilt and >repinned, so I'm pretty sure that it is a not pinning problem. The slots >are clean and the springs have been cleaned and polished. > >I'm pretty much at my wit's end and if I don't get this resolved soon, I'm >going to have to take a hostage. Any and all help will be gratefully >appreciated. > >Many thanks. > >Tom > >Tom Seay >Piano Tech Office >School of Music >The University of Texas at Austin >t.seay@mail.utexas.edu > > > >
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