If you have a disc sander, you could make a jig that has a peg sticking out that you rotate the shape around the hole. Something that looks like:
https://imgur.com/a/pOtxIGJ
If you have a disc sander, you could make a jig that has a peg sticking out that you rotate the shape around the hole. Something that looks like:
https://imgur.com/a/pOtxIGJ