botched agraffe stem removal

[Matt Wynne]

Hi All:

I've got an S&S parlor grand where a broken agraffe at the top of the 
tenor section was not removed well  as a result, there's been serious 
thread damage and at this point, I think tapping for a larger agraffe 
is needed.  Yamaha-style agraffes have a wide enough diameter but 
taps are not readily available locally as the thread is superfine.  I 
have not called Yamaha or S&S yet, as I plan to, but I was thinking 
that maybe some here have run into this problem and may be able to 
offer some sagely advice as to the best way to proceed.  Maybe 
there's some type of helicoil kit available?

-Matt