[CAUT] CAF

[Chris Solliday]

While I do agree with most of the remedies recently presented for CAF there is the possiblility of reducing hammer blow too much and reducing power by trying to "regulate it out." Sometimes, either because upon investigation you find that the centerpin height relationships to the string height have been tampered with, or possibly set incorrectly originally(?!) you may want to raise or lower the back mounting block (usually raise). If you do this you can reduce or eliminate the tendency to lock up on fast shallow repetition but you should rotate the entire stack around the hammer center pin by lowering (in most cases) or raising the front mounting block. This is the usual orientation for the stack in Steinways, higher in back. If you just raise or lower the rear block thereby raising the wippen (repetition support flange,ala Steinway) center you will throw the hammer center forward or backward causing among other issues centering problems. Depending on the degree to which one does this you may have to plug and redrill the screw holes in the mounting blocks although usually there is enough "play" in the cleat holes. This is the indicated "fix" in MM's fore finishing notes and Bob Marinelli and I have done this many times. It is important to note that pinning the balancier up is also very important as others have noted and I wouldn't want to move the stack around without having good friciton there first. But there can be other reasons to move the stack in this way not least of which is that someone else has tampered with the arrangement or that is was set incorrectly originally (?!) as I have said.
I would like to know what procedure you use Ed F. for replacing 88 cushions because installing 4 shims and making a few swipes with a plane on the mounting blocks seems like alot less work to me. But then I 've been so wrong for so long it sometimes seems like right to me.
Chris Solliday
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