balance hole reamer?

[Scott Jackson]

Re: balance hole reamer?John,
I have not before seen balance holes like the pictures that you sent.

I happen to have an old grand action on the bench at the moment for
re-pinning, clean-up, & key-bushing. Many keys are binding at the balance
hole, so I thought I'd try to counter-sink one in that style. It seems to do
the trick! The hole has nearly zero clearance to the pin, but performs
perfectly. I'm thinking of doing the same to all the keys.

Have you tried "converting" a key-set to this style?

Scott Jackson


----- Original Message ----- 
From: John Delacour

 The picture below shows keys from grand pianos by three excellent makers.
In all of them the lowest contact with the balance pin is made over 1mm from
the bottom surface of the key.