Hi John, Not a new design, been on many European pianos like Bechsteins for ages. Though I can't say that I've experienced the same noise, they certaintly do wear more at the screw contact point. When reconditioning action with new felts I back them out and regulate the wire as ususal. Brian Lawson, RPT Johannesburg, South Africa TEXOMA CHAPTER http://texoma.int.chapter.tripod.com ----- Original Message ----- From: "Piesik, John (JPIESIK)" <JPIESIK@arinc.com> To: <pianotech@ptg.org> Sent: Tuesday, February 20, 2001 8:12 PM Subject: Vertical Damper Lever Set Screws > On the back of the damper levers, on some new verticals (Petrof), are little > brass set screws. These set screws appear to aid in factory regulation, most > likely, on some sort of bench fixture (my guess), in order to quickly > regulate the pedal-to-damper lift adjustment without having to bend damper > wires. > > The problem is, these set screws, separated only by the damper lever felt, > rub on the chrome-plated damper lift rod. The result is a very noisy, > irritating grrrrroan when the sustain pedal is depressed. It's my opinion, > that if left as is, eventually, the felt between these little set screws and > the lift rod will eventually wear out resulting in metal-on-metal. > > I lubed the damper lift rod at the damper lever felts with microfine teflon > and lubed the damper lift rod pivot points with Protek. Still noisy. Next, I > backed out all of those little set screws on the damper levers (next time > I'm removing them completely so they can't fall out into anything). Now the > sustain pedal is whisper quiet. > > However, the damper-to-pedal lift now needs re-regulation (it turned out not > too bad, though). I think it was worth the price to finally be rid of the > sustain pedal "grrrrroaning." > > Have you seen/experienced these pesky screws before? I suspect that this new > design may not be worth the effort/expense if we end up having to remove it > to make it work correctly. > > John Piesik, RPT > > >
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