Drilling for oversize Tuning Pins

[Joseph Garrett]

According to my Statistics Sheet, the drill sizes that can be used are:
6.8mm (.26772"), 6.9mm (.27165"), "I" .272", 7mm (.27559") & "J" (.277).
Since a 2/0 pin is already .282" in diameter the hole is already too large
for a good fitting 3/0 tuning pin. Usually the reason for going to a larger
pin is because the original 2/0 is too loose. So, you truly will have to go
to a 4/0 pin to have an acceptable/consistant torque reading throughout. IMO
.010" under the size of the pin is about minimum drilling for an olde block.
Regards,
Joe Garrett, RPT, (Oregon)
P.S. If anyone wants a copy of my Statistics Sheet, (spec. sheet), I'll be
happy to mail or fax one to you.