On Nov 12, 1:16*am, "Michael Koblic" wrote:
....
1) I have the optical punch. I think I mentioned it passing in my
conclusion. I certainly prefer it, more so now after I
tried the hard way :-)
....
Michael Koblic,
Campbell River, BC

I use a fine-tipped prick punch (home-made from a broken tap) to make
a very small dimple at the line crossing, followed by a center punch
ground somewhat sharper than the angle of a drill bit. Usually the
drilled hole position is within 0.005".

jsw