I'm working on a double-sided PCB and for sturdy mounting I thought it
would be a good idea to have relatively wide copper-filled circles where
I drill a hole inside for the screws.
I used the "Circle" tool for this.
I would think having them on both sides would make the board even
sturdier, so how do I copy a circle from one side of the PCB, then place
it on the other side at the exact same location?