I was about to post the same problem on the left flipper for my ST LE - any other feedback out there on what worked? Planning to order some parts tomorrow.
Mine works a while and then sticks up horribly, but when I lift the playfield and try to get a better look I can't get it to stick. I thought it was something with the switch contacts since it released when the right flipper was hit, but the gap on both sides looks the same when the flipper is held/released.