<HTML><HEAD></HEAD> <BODY> <BLOCKQUOTE class=cite cite="" type="cite"> When you leave the caul in for that long do you= find you need a tighter fit, i.e thicker bushing cloth or you= end up with too much play?  David I.       ----- Original message= ----------------------------------------> From: Baldwin= Yamaha Piano Centre <<A= href="mailto:baldwin@mta-01.sk.sympatico.ca">baldwin@mta-01.sk.s= ympatico.ca</A>> To: <<A= href="mailto:pianotech@ptg.org">pianotech@ptg.org</A>> Rec= eived: Thu, 05 Sep 2002 18:06:25 -0600 Subject: RE: key= bushings Hi Isaac, I usually leave the cauls a few hours, but noticed that= the sizing is not as stable as I like= sometime.</BLOCKQUOTE> I have also noticed the= same thing on field repairs using PVCE glue, some times get a= recall for a sluggish key. <BLOCKQUOTE class=cite cite="" type="cite">  <FONT= face=arial color=#0000ff size=2>But as I use most often heated= brass cauls, I guess the drying is faster (in surface= anyway)</BLOCKQUOTE> Bin thar done dat.  Still do= it if I'm in a hurry.  Usually on a rebuild, we do every= thing that is needed to the keybed, then the action analysis, to= determine what parts to order. I think the big area= of movement, is the reaction of the water in the glue, on the= key button. Leaving them a couple of days, we have found no= sizing is needed on the bushings, only sizing the balance rail= hole.  This we size with a polished balance rail pin,= chucked in a battery operated drill, one quick pull of the= trigger, and the hole is sized to perfection.  We size from= the top down.  No guess work as to where the friction is= coming from. Key bed fitting, friction control, and key= fitting, is perhaps one of the most neglected jobs in our= craft. Regards Roger <X-SIGSEP> </X-SIGSEP>  </BODY></HTML>