I'm not sure this is really a "mod", but I highly recommend you check/swap out your flipper plungers! I was talking to someone who said "MMr plays like crap, but AFMr plays great" ...I asked why there would be a difference. He told me that CGC accidentally used flipper plungers on some MMRs that were too long...which results in the flipper not flipping as high, which results in weaker/different play. I did notice some weak play when I got mine, but I cranked the flipper strength up to +4 to compensate and never gave it a second thought. Still, I was curious about his claim -so I got some new plungers...and sure enough, when I took my old ones out...they were longer!!! After putting in the new ones, I was able to dial the strength back down to +1 and it plays great!