Could any one help me with a problem I may encounter in the future. I recently fitted a new bathroom suite but as my floorboards weren't level I laid a 6mm plywood sub-floor under the suite. It has only now occurred to me that were I to have a leak the ply could not be lifted without removing the basin or toilet. Is there any way of cutting the plywood while it is laid, for instance would something like a dremel work or a small angle grinder. Any help would be appreciated