Remnants after boole cut is made.

 From:  nycL45
3217.4 In reply to 3217.2 
Hi Michael,

The screw is one of two set screws on the front of a Bauhaus clock that hold the faceplate. I thought its size might be contributing to the rough edges. That said, typically set screws are about this size.

If you have not looked, I included in the file the thread profile and helix used as well as the center core.

I can eliminate the threaded section and be careful with close ups in that area.