The success rate will depend entirely upon the watches you are opening. I buy quite a few old Landeron, Valjoux and other vintage watches that are often neglected for decades. My success rate with a rubber ball (maybe 2 in 10) is bound to be worse than someone opening regularly serviced watches. Maybe Archer will chime in here, but I'd go as far as to say if a Submariner has been closed properly, (example) a rubber ball should not be enough to open it. Anyone?
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