Sorry, this is bad advice. This fellow is building an airplane and you
don't want any scribe lines that could promote cracking.

If this is true, he really wants to go out and buy a drill bushing to guide
the bit precisely. He also wants to make sure that bit is as short as
possible but still long enough to gon through thee entire tube to minimize
any flex at all.

Then again, a drill press isn't the right machine to be using (unless it is
a monster with a nice stable table) either.

Regards,
Joe Agro, Jr.
http://www.autodrill.com
http://www.multi-spindle-heads.com

V8013