The basic construction of the jig is straightforward, because its essentially made of plywood boxes. When you cut the parts, make sure they are dead square, because the accuracy of the jig depends on it. The rabbets help keep the pieces square during glue-up. You may find it easier to make the cutouts for the handle before you cut out the parts, just because you'll have more material to hold on to. I drill two holes and then use a jigsaw to connect them—you could use a scrollsaw or router as well. Make the clamp hole in the carriage with a hole saw, then save the circular waste piece to use under the lock knob.
1 made the locking clamp and the crank from wood, but commercial threaded knobs work. too.
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