<HTML><BODY BGCOLOR="#ffffff">In a message dated 12/18/04 5:48:46 P= M Pacific Standard Time, kam544@gbronline.com writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-= LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"> <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARG= IN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Salutations, I've got some regulation problems on a 50 inch Mason upright from the 70= s.  I've worked on other Aeolian uprights of that vintage, and some of = them have the same problem.   </BLOCKQUOTE> <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-= LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">The initial problem was tha= t the keys weren't bottoming out on punchings.  It seems that it's been= that way since new(though they bought it used).  There was a huge gap = between the bottom of the key and the punching when the key was depressed. &= nbsp;This led to hammers blocking, bobbling, and a feel that could only be d= escribed as spongy.  </BLOCKQUOTE> Something is preventing the keys from contacting the front rail punching= s. Whatever it is, I'd be looking to find out. <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARG= IN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">At my last visit, I adde= d punchings, and improved the feel somewhat, but some of the bobbling is sti= ll there.  I also had to increase letoff distance in some areas of the = keyboard an unacceptable amount to get it to work without hammers blocking a= gainst strings. I think that the main problem is that the key height is too great. &nbsp= ;It was somewhere around 70mm, though I forgot to write it down.  More = precise measurements are necessary, and they will be forthcoming after my ne= xt visit there in January.  Blow distance is at 1 7/8(the only thing in= the piano that seems at spec...:-), but it doesn't seem to be enough.</BLOC= KQUOTE> Taking the measures you is not going to solve the problem. <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARG= IN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">I tried lowering the key= height on a few sample keys by removing balance rail punchings, but there w= as nowhere near enough aftertouch.  Should I try increasing blow distan= ce to 2 inches or more?  Any ideas???  Haaalp??</BLOCKQUOTE> Increasing blow distance is only going to exacerbate the situation. Decr= easing the distance will enhance aftertouch. Find the reason for, "... There was a huge gap between the bottom of the= key and the punching when the key was depressed ...", and all will be revea= led. Keith </BLOCKQUOTE> Keith, That's what's been causing me problems.  I've searched and searched= , and I can't figure it out.  I've decreased blow distance, and there w= as not enough aftertouch and bobbling hammers regardless of how I tried to r= egulate it. I'll try to get back over there sometime early in the new year and see w= hat I can figure out.  Very frustrating piano.   Thanks for the input. Dave S.</HTML>