Oil Adapter Bolt Stretched?

Has anyone ever experienced a problem with their oil adapter, that it would not seal right despite using the appropriate mopar gasket set?

My mechanic and I have been fighting with it for some time now.

After the second time installing it and it still leaking I decided to give it to my mechanic to deal with, so everytime it starts leaking again I just go back to him and he "fixes" it. After him trying a couple of times, he decided that the sealing surface where the large gasket goes was warped, so he had the surface "Trued up". I am still experiencing leaking at the oil filter gasket!!

Now he suspects that we may need to replace the bolt, since it is hollow, it may have stretched from being over tightened?

Any thoughts?