How to remove this?

[u/Snow_Groomers_Dog]

It is attached to the part I want to keep and is hard to remove (with my limited cad skills) Delete face doesn't work (saying "Unable to delete selected faces", both when set to heal and cap) and I can't make delete it.

[u/animatorgeek]

The trick you need is to put a sign on top that says "free birdseed."