Hi, I have discovered the 1/2" copper pipe that comes from the wall to fill my tub has a hole caused by the set screw + excessive yanking on the shower diverter. Water was leaking back into the wall. The hole into the wall didn't have any caulking or other sealant - I plan to seal it up. What is the best non-soldering option for plugging the hole caused by the set screw? The repair has to fit inside the new tub spout.