I have recently started to take apart the clone 6497 from a watch which had stopped winding effectively. I removed the mainspring from the barrel but it was fractured. Ive tried measuring it with verniers but cant seem to find a mainspring for it on cousins. Does anyone have an idea of the spring required, or is it better just to buy a new unitas complete barrel with arbor and spring? third option would be to buy a new clone but this seems bonkers in terms of cost. Any suggestions would be gladl