Had a friend add a bunch of protectors to the MMR. I heard it was a lot of work. There were no significant wear issues from game play up to this point of adding the protectors. He said that there was zero detectable wear on any of the susceptible edges/areas, except the castle hole had a bit. I should be playing the pin more!
Here's the list of protectors
Shooter lane ball eject
Two switch slot protectors
PF flipper drain
Castle drain hole (not installed, went with Mantis)
Castle drain hole
Castle protector w laser etched rock pattern
Moat eject hole
Plastics (not on yet)
The Mantis castle drain hole protector was installed instead of the Cliffy version. Some people have said they prefer the mantis version protectors for new pins, but that wasn't specific to the MM castle drain hole per say. That one went on last as it looked ugly for install. In the end it wasn't that bad.
And interestingly, the merlin hole has two protectors in it; one on top (pinbits) and the other in the dished hole (mantis). Works great together, no issues here. Haven't even needed the rubber damper piece.
The plastics protectors install is more work and aren't installed yet, I'll pick away at it, but am in no rush since it's huo.
There is that new flat cliffy to protect the top of the pf around the moat, which I may consider, but I also have mylar and am leaning to using that for simplicity.
Everything went fine, no significant changes in game play, and it all looks great. Nice! And lots protected!