Drilling
I drilled out the holes to 7/16" per the template and then
setup to chamfer each hole so that the angle of the tapered hex bolt
head would sit just in the hole with out falling all the way into the
body and sit just about flush with the outside of the tube. This part
can be very tricky if you have never done it before so be very
cautious and take your time.
This
is the style of industrial chamfer bit that I used.
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