[Bend it like Bourgeois]

As soon as fotze arrives my chances for an answer fall to zero, but I'll try anyway...

My toilet leaks from the water input at the bottom of the tank. I thought it was the washer so replaced it but it still leaked. The helpful guys at plumberteria suggest it is likely a tiny crack in the tank.

Trying to get that plastic nut on tight as hell (woops, mistake) I stripped it a bit. Trying to get it off I stripped it a bit more. (woops, bigger mistake).

I hear the plumber laughing all the way to the bank. So before I go any further does anyone know a great way to get those little plastic nuts off.

And failing that...is anyone a trusty plumber?