I just purchased a new home and this handyman thing is very new to me. In the guest bathroom, I turned on the shower and the tub spout popped off the nipple. I never liked that spout anyway, so I purchased a Moen 3931 from a local plumbing store.

I brought the new spout home and tried to slip it on the 1/2" nipple, got about half way and it got really tough. I noticed that the nipple was scratched up and a little bit bent. I also noticed that there is a nice sized hole behind the pipe that has some plastic and putty. It looks like the previous owner did a terrible job trying to plug the hole.

Anyway, I managed to force the spout on and tighten the clamp. When I turned on the shower, water started slowly trickling out of the back of the spout into that hole (into the wall). I called a plumber and the guy they sent quoted me way too much to rip out my drywall from the other room and examine the issue. I told him to leave.

Can anyone please help? I really appreciate it. I attached a photo so you can see what I mean.