Always appreciated Wally. I figured that material was used instead of the "ceramic cup" that is typical.
I'm just not sure how well they will hold up over the long haul, soaking in 190 Everclear....![]()
I think PB had a video stating he does not put that back on his recoils. I suppose if the coil wires are fairly snug to the base and the coil is centered it would be OK but I'd worry about a short. May be nothing to worry about but that's just me.

I do think that taking the time to clean these properly makes a big difference. The only time I ever got a bad hit, I opened the caps and looked at a caked up coil...hadn't cleaned it in 4 tanks as a stress test! One bath later and it was rocking again.