In article 9Ik1d.263527$sh.202086@fed1read06, Daven Thrice says...

OK, I'm working with 1" extrusions, that are 90 deg. angles. I want to mark
a hole that is 1/4" in from one edge.

Use a scratch gage. Like I said, employ your dial calipers, or
if you want you can go to the hardware store and purchase a special
built one.

Jim


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