This section is from the book "Handy Man's Workshop And Laboratory", by A. Russell Bond. Also available from Amazon: Handy Man's Workshop And Laboratory.
A quick method of clamping a piece of work to the drill press or any table in which there are the usual holes for such a purpose is often a time saver.
The accompanying illustration shows a quick clamp, which can be made of metal for machine-shop use or of wood for the carpenter's bench.
The piece B is made L-shaped and is pivoted on the point F. The piece C is provided with a set screw, which rests against the heel of B. The shank of B is dropped through the hole in the bench, and the work placed under C, care being taken to have the piece B sloping back out of the vertical. Pressure on the set screw D locks the work under C in a very short time, and unscrewing: releases it at once.
 
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