The plunger in my bathtub is stuck (frozen) in the closed position. It is circa 1950 and used little as this it is in a winter home in Florida. I removed the handle assembly and pulled and levered as hard as possible on the plunger linkage but will not budge. If I pull harder the linkage will break. I have soaked it for days with every type drain cleaner and rust remover and penetrating oil I can get my hands on. No improvement. The wall is ceramic tile, the adjoining wall is a shower also ceramic tile. No access panel. If I open the wall next to the tub there will probably be a metal stud blocking access to the piping. Did I mention it is on a slab? Is there a way to remove the plunger so I can install a toe activated drain? Is there a cutter that can be put on the end of a snake to bore a hole in the stuck plunger? Please help. Jim