This instance I used the 2 1/2" circle punch, 1/2" punch, 3/8" punch (from the Itty Bitty Punch Pack)
First, punch the 3/8", then over that punch the 1/2" punch to create a ring. It took 15 rings. Then I ran adhesive around the edge on the back, and glued the rings on.
On a 1 3/4" it took 11 rings
www.stampapotamus.blogspot.com