Hi! The nut and assembly connected to the toilet handle is corroded and stuck to the inside of the toilet tank. I’ve tried liquid wrench, and tapped the nut and assembly gently with a hammer, but the nut remains stubbornly “welded†to the inside tank wall. I can’t move it at all, using a wrench. Should I try to hack saw through the nut? I’m afraid of damaging or breaking the tank. Is there any way to get the handle and assembly off in order to replace it? Thank you.