http://pasteall.org/blend/index.php?id=50320
I am using the testing ring as the difference (what I am removing)
The plane (haven't got to naming it) as the subject (Be removed from)
It won't let me use the modifier. I have tried recalculating the normals I have also tried it without the face in the center of the testing ring extruding the bottom face of the plane and and the testing ring by zero
Would appreciate the help!