Bass Drum O's 4" White round HW4

I cut a perfect circle... followed the instructions to the letter... but it was impossible to snap the female ring under the male ring... halfway yes but once I reached the opposite side of the ring the part that was snapped in jumped out... over and over again... until the female ring broke... I hope the male ring keeps sticking against my drumhead because it looks good and my bass drum never sounded better now that I have a porthole.

Nice lookin' hole but after two days the back part of it got off. The tape disconnected from the plastic. Grrrr. Maybe I did something wrong. Now I use it without that part. It works well anyway.