Hi Ladies And Gentlemen: If you are lucky enough to make or brrow a zapper formerly designed by Francis Mehaffey which consists of a 12volt transformer and a set of probes of which you would put onto the frozen letoff screws and the low heat would eventually loosen the frozen letoff screws. I have used this method a few times very sucessfully. If you need more information let me know. Walter GramzaAt 09:30 AM 11/12/00 -0800, you wrote: >What is this? A piano question? ;-] > >I'd try Protek. It won't hurt anything. If you can get at the broken >screws...prop up the rail and tap them out with a thin punch. CA in a shim >if needed and install new ones. > >David I. > >> -----Original Message----- >> From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf >> Of Dave Nereson >> Sent: Sunday, November 12, 2000 8:55 AM >> To: pianotech@ptg.org >> Subject: Re: pianotech-digest V2000 #984 >> >> >> Does anyone know how to loosen up "frozen" (seized-up) regulating >> screws -- >> in this case, let-off screws. This is in a Baldwin studio, only 20 years >> old or so. I tried turning them carefully and the eyelets would >> break off. >> So I had to take off the button, grab the other end of the screw with a >> vise-grips and turn out the remainder of the screw. But in some >> cases, that >> would break off also, leaving only that portion of the screw that's in the >> wood, and nothing left to grab. So I tried heating them all with a torch, >> thinking the expanding metal would also expand the hole in the wood, then >> when they cooled, they might turn easier, but no dice. They still break >> off. And they're not even rusty. I hate to put any type of oil or liquid >> lube, thinking that would expand the wood cells, making the let-off screws >> even tighter. How to get the remainder of the screw out of the wood? (I >> can do it by carving away enough wood to let me grab some screw with the >> visegrips, but hate to butcher the rail). Can ya buy a new let-off rail >> from Baldwin (it's the common studio model that's in many many schools)? >> >> >
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