Didn't get to this tonight, but I think I figured it out on my own. There's two screws that seem to act as "stops". Found out my issue isn't with where it's SUPPOSED to be stopping but that the guides aren't screwed down properly....the screw holes are stripped and loose in the wood. One is tight the other two are F'ED...
Have no clue how I'm gonna fix that...got no idea how to disassemble the whole visor mech.
But I did get my left flipper rebuilt. Apparently it's not supposed to have a lane change switch, but mine did, and the wiring is off, but it wasn't hurting anything...I just put everything back the way it was, even the added lane change switch (wtf..) and it all works. Just got to get the flipper adjusted.
Also was trolling old Pinbot posts too and fixed my issue with the ball screwing up on the spiral ramp by moving the shooter. That's been bugging the crap out of me for weeks!