On my pair, one can feel a slight discontinuity along the outer curves — it’s not there in the drawing, and I can’t see it in the preview, so I guess it gets introduced during the actual G-code interpretation by Grbl. I could file it off, but I’ve left it there, intending to make a second pair for comparison.
I can use some hand tools, as long as it doesn’t require any true skill. I can cut with a saw and sand something but ask me to chisel something and well you may as well call the hospital. lol