JB Weld is a great, great product, but like any adhesive, even epoxy, it requires a good (and reasonable size) mating surface between the two parts being attached together. In my case, the break in the pin was not a clean break, and there would only be 1/8" of surface area to epoxy. A bump on the tip of the spool pin could easily defeat that repair. It was a good idea, though!
Thanks.