Here's the bottom of the clamp. There's a 1/4" dowel pin which rides in
a slot the runs the full length of the jig. The dowel acts as a pivot,
allowing th half-nut to be moved away from the allthread and allowing the
clamp to be quickly positioned. As the clamping portion (left side of this
picture) is tightened, it forces the half-nut tigher into the threads.
Bigger...
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