I was looking at these pieces and being the owner of some fairly large hole saws I thought that a easy to make the pieces would be to simply use what is normally the waste from when you cut a hole and use them for the round pieces for this project. They will have the same size hole and will be perfectly round. You can then use a bolt the same size as the hole for the axle. If you use a backer board when you cut the circles you should get fairly smooth edges.
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