The best forge to use, if he was willing to do the work himself, would be the one attached to Khonnir's inn, which he'd gladly lend the use of, though he's in no real shape to do the work, himself. Otherwise, he'd need to track down a blacksmith in town; fortunately, there's plenty of them, and pay their fee for the work; anyone appraising the work will note that it looks like difficult, time consuming work; likely taking a full day's work, with no guarantee of success; and they'll ask for the fee upfront, about 50g.