[pianotech] Pulley Key repair - (again)-was balance hole break-loose noise

[Joseph Garrett]

William M said: "I'm told it works but haven't done it. I like the
reliability of the Onesti
system in that with care, it will absolutely maintain the position of the
balance rail hole. Veneer shimming has more potential to relocate the hole.
This certainly may be a case of using a microscope when a magnifier will
do, but..... 
 
William,
Like any other skill we use, it takes a little practice to get it right. I
use an Exacto saw, (used to use a "Gentleman's Saw), if I'm using really
thin veneer. (all veneer is not the same thickness...depends on the
vintage/source) BTW, I usually make my own veneer for such jobs. Place the
saw blade AT the hole, not IN the hole. A few careful strokes and you will
have the proper slot to insert the veneer. Remember to not go past the
balance hole depth itself! Remember the profile of the Balance Hole Mortise
in your mind's eye, (side view), when you do this and it'll help NOT to go
too deep.<G>  
"Also, veneer shimming won't address the sides of the hole." ???huh???<G>
If the sides of the hole have been filed, then you are correct in wanting
to replace the "hole". However, on normal balance hole repair/sizing/etc.,
the sides of the hole are not the issue. Using the Round Toothpick trick I
described in my last post, can be done on the sides of the hole also. One
Caveat tho: because you are working in the grain line of the wood next to
the hole, you will need to proceed very carefully with the pounding in of
the toothpick. Another DAMHIK<G> In this proceedure, I insert a balance
pin, before pounding in the toothpick.
Best Regards,
Joe


Joe Garrett, R.P.T.
Captain of the Tool Police
Squares R I