I cut a delrin bushing to fit the rear tang snug to my headstock bore. As to the tapered part, I wrapped that with soft copper wire I stripped from some Romex I had laying around.
Turn an aluminum or brass bushing with the matching taper and then split it. If it's a shallow taper it will be fine. I've done a few barrels that way and they all worked out.
Originally Posted By AFCarbon15: I would do everything between centers. Turning, threading facing the shoulder. Then part it off and crown it using any if the above mentioned methods