Planetary gear winches are designed to work (pull) in one direction due to how it's internal brake holds. Spooling the line off and back on on the outside of the spool is a bad idea with most winches. You'll be fighting the brake when spooling in, and you lose the brake when holding.
Also, some manufacturers do NOT advise flipping thier winches upside down, period. Check with the winch manufacturer about your specific winch before respooling/reversing wires or mounting upside down.
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