[pianotech] Size of Pinblock Drill bit?

[Jim Ialeggio]

Interesting bit (haha) make that idea I got from Bruce Clark and Jason 
Andino at the Haverhill WNG training class:

First pass 1/4" drill of the type you prefer, I'm using a fast spiral so 
I don't have to take 2 or 3 plunges to clear the bit. Then for the 
second pass, by hand, fast spiral "nubbed" bit.  Doesn't grab and pull 
through, and doesn't beat up the start of the hole.

Jim Ialeggio

-- 
Jim Ialeggio	
jim at grandpianosolutions.com
978 425-9026
Shirley Center, MA