For wire weaving such as described in the July issue of Jewelry
Artist, I use a quick clamp (that is the name of it), which I got at
the local hardware store for around $5.00. It has plastic jaws, which
come in different sizes. I got the 1" and 1-1/2" sizes. Then, once
you fasten your wires between the jaws, you click the clamp tight to
hold the wires. It adjusts to different sizes.
My only objection is that it is awkward to use. It works, and one
can do nice weaving with it, but if it was clamped down the work
would go faster.
From the one pictured in Jewelry Artist, it should be very easy to
make. Looks like an angle iron which has holes in it, and which is
then skrewed to the board. The other iron seems to be just a flat
piece. Both pieces have holes in them and the two pieces are bolted
together. One would tighten the bolts firmly to hold the wires in
place. Seems like a very easy project to make one of these. I would
make it so that I could clamp the board to my bench so that it is
firmly secured. I would cover the jaws with pieces of rubber or
flexible plastic, so as not to mar the wires.