The hinge pin is unlikely to wear out, the blueing on it will wear off sooner or later, but the pivot in the underlug is much softer material and will wear, specially if it's not lubricated. Shimming can be done at home using the barrel fitting info in the FAQs. I've done several, the first was a home job 40yrs ago on an old shotgun. I use Tetra grease on the pivot, seems to work very well.
Tim