Mangled copper pipe (nipple for tub spout).

[Anthony]

It all started when I forgot about removing the set screw, before I removed the old spout.

The copper nipple's threads no longer exist...therefore, I had to remove the nipple...using a pipe wrench, I still could not get enough torque to break loose the nipple...I ended up partially twisting the nipple...

Any suggestions???

[Speedy Jim]

Set-screw spouts are slip-on; they don't use threads. This is plain ole copper pipe (tubing) you have. Very likely, the end inside the wall is not threaded into anything, but rather is soldered into an Elbow (not visible).

First step would be to gain access to the space behind the tub. Normally, there will be an access panel. If not, can you make an opening in the wall on the other side?

If it is as I'm imagining it, you will have to either solder (torch) a new length of copper tubing in place or, maybe, cut the old tubing and use a compression fitting coupling/elbow to avoid soldering inside the wall.

Sorry to say-experience counts for a lot in difficult situations like this one.

Jim