I recently saw at one of the trade stands at the 3D champs retailer selling tapering jigs.
Lee Philips has produced a jig that allows arrow makers to taper wooden shafts down for barreling of arrows. Sadly I didn’t get chance to buy one at the event but ordered one which arrived at the weekend.
I’m yet to use it but am very impressed by the construction, just need to find some shafts to try it out.
Will give a full review once I’ve tried it out.