Just installed the carbon protectors on the prison door magnet and the opto began missing hits about 50% of the time because the ball would jump over the protector. Taking it off tomorrow. Might try freeze spray for this.

I think I'll just put down some Mylar around that magnet and make sure it's a bit higher than the pf.

I'll leave it on the well walker as not having any problems there.

Not concerned about dimples on the magnet. The protector is for the playfield around the magnet which is prone to wear like:
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But this new magnet design used in TWD with the larger metal plate surrounding the magnetic core probably eliminates a lot of the problem. And Ive raised the magnet slightly above the PF which should also help.

Yeh, with the new magnet it looks unlikely. In the photo above I think the magnet might be below the PF slightly which is causing the wear on the edge. Ill just run with some mylar - not having the prison shots register sucks - and makes a hard game even harder.