I needed a circle-cutting attachment for my Porter-Cable plunge router, so I decided to modify the existing guide. I removed the three flathead screws holding the edge guide shoe and set it aside. I then replaced the two outer screws for safekeeping and threaded a short length of 10 - 24 threaded rod into the center hole to act as pivot. In a few minutes (and at practically no cost), I had a circle-cutting attachment with micrometer adjustment.
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