<HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=US-ASCI= I"> <META content="MSHTML 6.00.2900.2802" name=GENERATOR></HEAD> <BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; BORDER-T= OP-STYLE: none; FONT-FAMILY: Arial; BORDER-RIGHT-STYLE: none; BORDER-LE= FT-STYLE: none; BORDER-BOTTOM-STYLE: none" bottomMargin=7 leftMargin== 7 topMargin=7 rightMargin=7> <P>I agree with Wim.  The bobblying is certainly because the = jack isn't getting away from the butt enough...make sure the checking d= istance is right...<BR></P> <P>David Ilvedson, RPT<BR>Pacifica, California<BR><BR><BR><BR></P> <DIV style="PADDING-RIGHT: 5px; PADDING-LEFT: 5px; PADDING-BOTTOM: 5p= x; BORDER-LEFT: #000000 3px solid; PADDING-TOP: 5px"> <HR> Original message<BR>From: Wimblees@aol.com<BR>To: caut@ptg.org<BR>Recei= ved: 1/15/2006 2:29:14 AM<BR>Subject: Re: [CAUT] M & H model 50<BR>= <BR><FONT id=role_document face=Arial color=#000000 size=2> <DIV> <DIV align=left>In a message dated 1/15/2006 12:23:47 A.M. Central St= andard Time, abousel@comcast.net writes:</DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: = blue 2px solid"><FONT style="BACKGROUND-COLOR: transparent" face=Ar= ial color=#000000 size=2>There is a Mason & Hamlin upright mode= l 50 (vintage 1975) I service and at the last tuning the owner was comp= laining about bobbling hammers. The hammer pinning is very loose. I pla= yed around with the note that was bothering her the most and through a = combination of repinning and strengthening the hammer return spring was= able to all but eliminate the problem. The piano is in good regulation= . Here's the issue: The action is really poorly made. 1975 was not exac= tly the golden age for these. In repinning the one I did, I could see t= hat the flange bushing cloth was poor quality. It would be wonderful to= replace the whole action, but that's not going to happen. Does anyone = know if it's possible to get replacement hammer flanges? These flanges = are different from the generic ones sold by piano supply houses. If tha= t's not possible, I have to go with rebushing what's there. Any recomme= ndations on a good source of flange bushing cloth? I know M&H are m= aking these again. Anyone know if the action design is the same?<BR><BR= >thanks,<BR>Aaron<BR><BR></FONT></BLOCKQUOTE></DIV> <DIV></DIV> <DIV>Aaron. </DIV> <DIV> </DIV> <DIV>The problem might not be in the flange pinning. You need to figure= out why it is bobbling. It could be that there is not enough key dip. = Even taking out a .005" punching is sometimes enough to make a differen= ce. Also check the condition of the catcher. Roughing it up a bit will = give the back check something to grab a hold of. Try pushing the back c= heck forward or back a little, and see if that will get it to check bet= ter. </DIV> <DIV> </DIV> <DIV><FONT lang=0 face=Arial size=2 PTSIZE="10" FAMILY="SANSS= ERIF">Wim </FONT></DIV> <DIV><FONT lang=0 face=Arial size=2 PTSIZE="10" FAMILY="SANSS= ERIF">Willem Blees RPT<BR>Piano Tuner/Technician<BR>School of Music<BR>= University of Alabama</FONT></DIV></FONT></DIV></BODY></HTML>