Is there a way to remove a through-hole?

Need help? We are here.
1

The problem is that the holes were not created by Shapr3D, but by Sketchup. The holes look like this:

image
image830×636 56.1 KB

Thanks,
Duncan

2

Sketch a circle around the jagged hole. Extrude then delete the new hole.

3

Bloody hell, that was easy. Thank you.