Closeup of the circle-cutting jig. Ensure that the jig is securely clamped to the table. The jig should not actually touch the router bit.
The right-most 1/4" hole in the jig is the pivot point for cutting the circumference of the circle; the left-most hole will be used
later to cut a circular slot for preventing the plywood disk from rotating freely on the upright.
NOTE: I didn't do this but discovered after the fact that I should have--the distance between the right hole and
the left hole should be about half the distance between the holes made in the upright.
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