I need advice. My parents have a bathroom w/a toilet in their basement and I need to change out the toilet mechanism. I turned off the water, drained the back holding tank but I'm having a bitch of a time removing the plastic stem on the old mechanism from the bottom of the back basin. It's a bitch trying to fit an adjustable wrench back there to actually unscrew the stem of the old mechanism (there is only like 2" of clearance), any hints on how to un screw the old mechanism out from the back basin easily? I'm about ready to take a sledgehammer to the fuckin thing.