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Screw together two 3/4" pieces of material to make a block.
Use a hole saw on the drill press to cut a hole through the center of the block (Image 1).
Use a drill to make holes for the rods (Image 2).
On the table saw, split the block in half.
Glue the dowels in the holes in one half of the block (Image 1).
Put the block back together (Image 2).
Place the jig on the drill press table.
Put the ball into the jig. Center the ball over the center hole in the table.