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The base of this jig is .75" plywood 19.75" x 10" (these are arbitrary measurements, so use whatever works for you). Screw to the bottom of the base a little cleat, or keel, that clamps into your vise. Screw a straight piece of wood .375" thick and 1.5" wide to the top & front of the jig. Cut a triangular shaped piece of wood .375" thick that functions as a wedge, and then screw another piece of straight .375" x 1.5" piece
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The triangular piece of wood wedges the workpiece in between the two thin pieces of wood. Tap the wedge in place with a hammer or mallet and that little piece of exotic wood is ready to be planed, mortised, carved, or chiseled.