I don’t have a collared ferrule for my shaft replacement on Nike Fly irons. Can I use a regular ferrule?
Since it’s the epoxy bond between the shaft and the hosel that secures the head to the shaft, you can successfully use either ferrule. The collared ferrule gives a nicer, snug fit, but regular ferrules can be used right up against the top of the hosel so that you can’t tell which kind you’ve used. Hope this helps! Michael