Holey Firing Pin!
Howdy jeff, and welcome aboard.
The best way to fix it is to open up the hole to a substantially larger diameter and heat-shrink a hardened steel insert with the correct diameter hole, with a dab of LocTite Stud and Bearing Mount to cinch it. A fairly expensive method, due to the required precision involved, and the decision as to whether the gun is worth the cost is a personal one.
The problem with making an oversized pin is that, worn holes generally don't wear evenly, and wind up being egg-shaped...or worse...which necessitates opening the hole up a little more to make it round/concentric...and making a firing pin that's possibly as much as a 32nd inch oversized. If the hole isn't too badly wallowed out, the oversized pin route might be feasible. Pick a smith for the work...carefully...not all smiths are created equal...and let him(or her) make a suggestion.
Luck!
