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Thanks for the tip jwh1975! My battery was dying on my Flexcare+ (it stopped holding a full charge) and then right after I ordered a replacement battery the shaft stopped vibrating even though the battery had power and I could hear it whining but not vibrating. After replacing the battery I struggled to figure out what was wrong since the shaft seemed to be fine and I couldn't find anything broken. I found your advice and moved the coil back down and that got the shaft vibrating again. I guess with the handle vibrating the coil eventually gets loose and makes it's way up.