Jacksonville, FL
I've had to adjust this a few times. It's really a two person job. Pull the playfield out (you shouldn't have to disconnect any wires) and rest it sideways on the edge of the cabinet. Needless to say, be careful not to rest it on any of your playfield objects. Once it's out there's, plenty a room to reach it with your hand under the ramp. The other person helps hold the playfield and he/she can tell you when it's in the proper position.
This is way easier and quicker than removing the ramp to get to it.
