My 45G foldover used a Dutton Lainson DL2500,
which had a positive locking clutch. You had to CRANK it
down, for it to come down. No free wheeling.
If what you have does NOT have such a clutch, you have
the WRONG winch.
Look in the Grainger catalog, for a suite of choices which
may fit the tower-mount bracket which Rohn fabricated. The
winch itself doesn't have the attachment/interface.
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