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A few minutes with a drill press (through-drilling the handle) followed by through-drilling the winch shaft to match... put a lock pin or bolt through the holes and you've got a handle that won't slip off.
Thanks for the suggestion, Clam (may I call you Clam? <g>). I kinda thought about that idea, not sure I've got a drill with the power to drill through that winch handle, but I may give it a try.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.