One of the most useful devices I own is a screw & drillbit 'template',
brand name "Screw-Checkr". This is a plastic rectangle with holes to check
screw sizes, and also thread types,i.e.,coarse, fine, machine. It also has
the drill decimal equivalents for each size screw hole so you don't make
too small or big of a hole. It also breaks down the measurments for the
right drill sizes if you need to drill & tap a hole for threading.These can
be found at tool specialty shops, or contractors' supply houses.
Dan N7CQR
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