Quoted from BeeGeeMtl:
I received my R&M about a month ago, had issues with flippers like most people but last night the POP BUMPER stopped working. Nothing happens when ball hits it. Can anyone offer any advice on this? I'm a newbie, not a techie so please "walk me through it", if need be. Thanks!
Nuts fell off the plunger beneath probably, because they put 3 washers on there for some weird reason which undermines the nylok nuts ability to do the "lok" thing, because no thread left. Look under playfield to see if anything looks broken or loose to start with. At about 2 weeks mine fell apart and became a dead-pop dimension 24/7 lol
Same thing happened with my TNA and RaM.
Ditch 2 washers, keep one, put it back together.
**Or what MikeS said below there.