Thanks Rusty appreciated.

We have a few scrapped mast in Boston area that could be used as ginpole.
Although a J30 scrap mast seems to have a bit of a premium around Boston vs. less known boat.
Was the gin-pole you saw also a J29 mast?
Would you have any picture of how it was rigged?

I am thinking indeed a gin-mast stepped (but 3 way articulated) on the peer at the base of our crane, a main backstay passing through a block at the top of our crane to get a good angle + two guide wires and a 40:1 scrap winch preferably self-tailing for safety.