@markschum,

My previous post was aimed at unbroken-fighter (I should have made that clear), with a view to him eventually rigging the hoist, or similar models, himself, and explaining what is needed in a geometry before it can be used in a figure.

Re the position of the jacking arm. Sorry, it might be in the correct place. I think I failed to load one part. Is there something missing here (see image above), and if so, what is the missing obj called?