Quoted from sc204:I put on the Cliffy's but the rings that go around the magnets both eventually started to come loose and bend up affecting ball travel and even trapping the ball on the upper right magnet. I had to remove them.
The munchkin playfield edge and the non ring ones seem to be working well.
I had the same problem (not only with WOZ but other pins as well). I would leave the Cliffys rings off.