Gotoh Magnum lock tuners won't tune up!

Updated
morphius1
I'm trying to tune up from drop C to standard and my g and a string tune up but only to a certain point at which if i keep turning the machine head, the string post stops turning - thus not tuning up any more. How can I fix this without restringing it? Cheers for any help Edit: It resolved itself :P now how do i delete this thread?
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