[gary]

Originally Posted by davewaldo

Hello, I used a router attached to a small piece of ply. I then screwed this bit of ply into the job material and then pivoted it around to cut a perfect circle. A bit like a compass. See the attached photo.

http://img.diynetwork.com/DIY/2003/0...121_1fe_lg.jpg

Video here of a gentleman cutting a mirror box cover in a similar way -
https://www.youtube.com/watch?v=yJgRg_W692U