<html> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; = charset=us-ascii"> <meta name=Generator content="Microsoft Word 10 (filtered)"> <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1>  </fo= nt>   -----Original = Message----- From: = pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Pianotunaguy@aol.com Sent: Wednesday, June 02, 2004 10:18 = PM To: pianotech@ptg.org Subject: U1 hammer butt = problem   I recently re-flanged my U1 due to bobbling hammers caused by the silk = thread which holds the hammer butt spring being broken on about half the = flanges.  Since that day, I have a new problem with the piano: the jack gets = caught under the hammer butt on rapidly repeated notes and blocks the hammer to the = strings.  This happens on about 10 to 15 hammers in the middle of the = keyboard. I checked the backchecks and the hammers are checking at = 5/8".  I checked the lost motion and there was enough to allow the hammers to = move back with the hammer rail when pulled away from the strings.  There is = enough dip to allow the jack to letoff.  The piano does get a lot of use; I teach 15 students/week on that = piano.  The piano is about 30 years old and these are the original butts.  = So I could imagine that the butts have finally worn to the point that there = is a dent or something catching the jack under the butt.  I thought the = next thing I would try is to apply Teflon powder to the butts.  (And = remove one and take a good look at one...) But it seems unlikely that this problem didn't exist and then all of a = sudden 15 of them all develop this problem at the same time.  Am I missing something?  Can anyone offer me some advice? Thanks PianoTunaGuy       =             =      Mystery Man,       =       Tell me your real name and I’ll offer some = suggestions—       =       Never mind--- You didn’t mention let off. If it’s too close = blocking can occur on repeated blows as you describe. Also you don’t need that = much lost motion.       =             =       How much time did you take replacing all the flanges? Traveling them of = course as I’m sure you did, not to mention having to retighten those flange screws and = space hammers.       =       This was my pet project while prepping quite a few U1, 2, and 3’s .in = past years       =       My post on replacing just the cords is in the archives.       =             =       Tom Driscoll       =       P.S. List etiquette suggests signing your real name, or are you Toppers = cousin?       =       </div> </body> </html>