Reply To: Rebating a Round or Curved Shape
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There are tools to do this: https://www.amazon.de/dp/B002CB5HH6/ref=asc_df_B002CB5HH641154923?smid=A3JWKAKR8XB7XF&tag=wbmchd_homeimprovement-21&linkCode=df0&creative=22494&creativeASIN=B002CB5HH6 But they are quite expensive, and for a clean cut, you need a perfectly round knife wall first… However, these tools can be used without a machine, so they are “legal” 😉
If you have a router plane, you could fix it to a board and screw that board to the center of the hole, sort of a compass router plane. Before starting, better make a similar device with a knife to create a knife wall.
Alternatively, you could boil strips of wood in water and fit them to the round. If one piece is too thick, try laminating thinner strips.
Apart from that, perhaps you can save the original board. A mix of saw dust and animal hide glue works wonders on worm-bitten surfaces.
Dieter