Friend of mine over in Illinois has one or two of them, pretty cool to have on an old truck nice score!
I had one on my '79 K10, had to go through it to get it working though, rebuilt motor and new solenoids.
even before I clicked this thread open I knew it would be the hickey sidewinder.![]()

that grease is DRY![]()

Probably have to cut it off. 
Do the Hutterites have an aluminum welder?
watch cutting the cable off it will spring out and fly around a little bit .
and that style motor looks about like the older ramsey worm gear winches . . . so looks for a replacement for one of them and check bolt pattern and shaft size and stick out . you might get lucky with that .
take the aluminum cover to someone who can TIG weld it . don't waste your time with spool gun weld on this repair .
Right on!Subbed for the future if I can ever get my hands on one of these.