Quoted from Sonic:
The potting material is irrelevant to the sensitivity - its' simply there to hold everything in, insulate and protect.....it doesn't have to be completely filled....sensitivity is a little more tricky to adjust for the end user (you have to have the parts...)....
Dave, what pics are you referring to? Is it below where the original Cherry was...over by the whirlpool wire ramp or by the wire ramp that dumps the ball to the right inlane?
I'll just PM you. Really not a huge deal still Love it!