Valve seat is stripped (bathrub cold water handle)
So I have a leaking handle in the bathtub (cold water). It's a gerber stem. I replaced the washer on the stem but it didn't do anything. Then I took a look at the seat and it's a little worn.
I tried to remove the seat using the seat wrench but the the threads are completely stripped, can't get a grip.
What's the best way to remove the seat? I'm wary of drilling it out, I don't want to damage the pipe which would turn a $3 problem into something that will require tile removal and welding a new pipe.