What can I do about a spot of rotten floor where I need to put in one of my toilet bolts when replacing a wax ring?
Mobile home floors are almost all chipboard of some kind. If you leave this damage it's only going to get worse and possibly soon now that it's rotten in the centre. I have come across a number of mobiles like this and I always carefully cut out a square around the toilet flange, remove the rotten piece and brace the edges underneath with plywood, then replace the rotten piece with 5/8 plywood. Works every time.