<HTML>In a message dated 2/2/2003 7:36:12 AM Pacific Standar= d Time, oleg-i@wanadoo.fr writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT= : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Subj: RE: Bearing difference= on different soundboards Date: 2/2/2003 7:36:12 AM Pacific Standard Time From: <A HREF="mailto:oleg-i@wanadoo.fr">oleg-i@wanadoo.fr</A> To: <A HREF="mailto:Erwinspiano@aol.com">Erwinspiano@aol.com</A> Sent from the Internet Thanks much , a very good vi= ew.   I understand that if we see,= for instance 1/4 inch crown from below the board, that does not really mean= that having 1/4 distance bearing at the string rest will absorb the whole c= rown, it depends of the back string length vs. the speaking length.<F= ONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY= ="SANSSERIF" FACE="Arial" LANG="0">   Do you use this as a "rule o= f thumb" , or do you go thru that computation about rear length to know how = much distance is allowed before the board reverse crown ? (as suggested by N= ick Gravagne in the articles he write)   The basic idea of my origina= l post is that as we aim for internal tension in the board to produce a good= tonal response, we may use the more appropriated process when bearing, and = that the bearing on cc crowned board with nod add that tension (at last in t= he bass and medium), while on rib crowned boards, internal tension is very l= ow before down bearing is applied (unless it is build when you glue the boar= d on its perimeter.   I am very far from truth, or= just a little bit .>) <B= R> We too see bearing load appl= ied regularly but without relation to crown often, and often too I see too m= uch bearing in the killer zone, that tend to deform even more the panel.&nbs= p; The Bob Grihalva add on seem to help well, and the result is very clear (= cleaner tone and better sustain).   Have a nice Sunday<FO= NT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY= ="SANSSERIF" FACE="Arial" LANG="0">   Stephen is looking for a goo= d place where to have his eyelets made actually they are too expensive to be= sold.  his string rests are tunable on a 3mm zone (1.5 high,1.5 down) = , and are 5mm tall, but as they have to be installed on a metal support to b= e moved, the final height is more of a Steinway aliquot scale actually.</FON= T>   Best Regards, form snowy Par= is !   Isaac OLEG Entretien et réparation de pianos. PianoTech 17 rue de Choisy 94400 VITRY sur SEINE FRANCE tel : 033 01 47 18 06 98 fax : 033 01 47 18 06 90 cell: 06 60 42 58 77 <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT= : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">-----Message </BLOCKQUOTE> </BLOCKQUOTE> </HTML>