In our bathroom, we have a wall-mounted mirror (un-removable) wherein the bathroom spout and handles are mounted behind the mirror. I need to replace the valves in the faucets as they have been leaking for sometime.
I can't get a 31/32 sink wrench around the existing valve because the (genius) who mounted the mirror didn't cut the holes in the mirror wide enough to do so. Can almost get the wrench in, but I'm confident anymore forcing or torque will crack the mirror.
I need to widen the existing holes (1/4-1/2") in the glass around the handles to get the wrench in there.
The picture below shows all this, though it also shows part of the handle stem protruding which I can remove to do the job.
I'm thinking a dremel with a diamond bit, allowing the mirror to cool regularly with breaks (can't use water because it'll get inside the wall), wearing lots of protection including mask for a possible mirror shatter.
The whole thing may just need to be replaced if this won't work or when I break it. Any advise?