I was frustrated because no matter how hot I made the cap with my torch, I couldn't bend it back to the right shape. I thought I was going to need to make a new one and weld it on, but I found a solution that requires no welding and works just as well as the original!
The style of muffler I have is the one with the big baffle on the inside and a long tube protruding from the inside of the end cap.
Pretty much, the solution is to get a big steel washer and drill a hole through it. Then bolt it on with a few smaller washers and a lock/spring washer. And that's it! Cost me $3 for the parts at Orchard Supply Hardware(my favorite hardware store).
Here are the parts I used:
- Fender washer - 1/2" x 2"
- Lock washer - 7/16"
- 2 flat washers - 7/16"
- 1 steel bolt - This can depend on your muffler so just pick the right one.