Ed I agree it's easy enough to move the pivot. I move it completely from it's original position anyway so it aligns with the under lever center pin. Solves a multitude of Steinway problems ie damper upstop rail adjustment troubles,heavy pedal,thumping dampers, and others ugghh! It's no problem moving the pivot fore or aft a tad & also pulling the sos. rail toward the front a stich. Also I believe pre-coved back checks are available. I have some in stock which are coved on the back side. Steinway O's seem to be partcularly problematic as far as tolerances. I've done this a couple dozen times & only freqently is this a big deal. See posted instuctions from a-z in archives under Steinway underlever system modification.. I think. Dale Erwin David writes: << Frequently when installing new Renner underlevers I run into the problem that the new sostenuto tabs extend farther out than the old ones. <snip> What is the best way to modify the original set up such that I don't create other problems. >> I have run into this problem, as well. I don't know that there is a silver bullet fix, but rather, a series of small changes, spreading the tolerances around. The pivot point can be moved distally a little, (however, it is necessary to make sure the key-end felt will still engage them). The rod may be taken in as far as it will go. Make sure the back-checks are as steeply angled to the hammer tail as possible, and even then, may need to have a small cove cut in them to allow maximum movement of the rod away from the tabs. I once asked Lloyd why Brenner can't give us a smaller tabbed top-post, and the problem lies in numbers. There just aren't enough pre 1950 Steinway back actions being rebuilt to justify another part-number. Regards, Ed Foote RPT http://www.uk-piano.org/edfoote/index.html www.uk-piano.org/edfoote/well_tempered_piano.html -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20061214/d2067eff/attachment.html
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