Part of the design is that the top circle is able to slide from side to side, so to make this happen I had to cut a slot into the top of the middle circle. I made a scale drawing to figure out how wide this slot had to be in order to get the correct angle of movement.
I had considered making this cut using the router but then I found out that the base plate of the drill press is able to rotate. It was quite convenient that there was still a hole in the center of all the circles that I had used on the router table, I was able to bolt the timber to the base plate to keep it in place while I drilled.
I drilled the holes as close together as I could without the drill slipping which meant that there were still small joins between the holes. I chiseled these out, being careful not to split the grain in the wrong direction, and used a file to make the inside surfaces even and made sure that the blot has enough room to slide without being so loose that it will flop around.
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