I have to replace the siphon diaphragm on a wc. Naturally the wing nuts are totally corroded and there is not enough room to get a small hacksaw on one side due to the bath being in the way. Plan B, remove the wc complete, only to find that the pan is screwed in with four screws (rather than the normal two) and they are more rusted than the wing nuts. Any ideas how to get around this other than introducing the special tool (A sledge hammer) troublesome