Ive never had this issue before (well maybe once ! ) but ive just taken both chrono hands off a watch and they have both come off leaving there pipes in the pinions. I usually use two collet type removers and pry them off but this seems to be no good for the ones that are punched onto there pipes and have been manhandled in the past. I can probably put them back on with my punches bit ive seen some tools about but not to sure because even though I'm protecting the dial accidents can happen. An