A guy on another site gave me this tip, put a weight in the shaft from the nock end and swing it so it slams into the insert. I use a screw that fits into the shaft, it's kind of heavy and after several blows the nock comes lose and works it's way out. I'm not trying to save the shaft when I do this just retreaving the insert. Does no damage to the shaft as far as I know, but I've never been concerned with it.