I use meticulous measuring.

--
Christopher A. Young
Locksmith with 25 years in the trade
Learn more about Jesus (with 2,000 years in his trade)
www.lds.org
..


"cubby" wrote in message
...
Is there a foolproof way to do this, other than meticulous
measuring?
I never seem to get it perfect first time, and then once the
screw
holes are made it's difficult to reposition. I'm sure
someone on here
has a cheat.