Posted by Marty Neilan on April 22, 2002 at 07:22:38:
In Reply to: Seeking the right Helleberg posted by Mark on April 21, 2002 at 18:03:30:
Last week I drilled out a Conn 2 to 11/32". No other changes. I find the medium V cup and now open backbore made for a good quintet / lighter literature mouthpiece with an equally accessable high and low range to compliment the massive Warburton Neilan I normally use on my 5/4 piston CC .
P.S. I drilled by HAND and went from the shank side, turning the bit backwards so it would slowly grind metal away and not grab. Took a long time but produced a very smooth and accurate hole