My davit of 2 x 2 hitch stock is mounted. About twelve feet base to top.
Ninety off that three feet long and a diagonal. Electric hoist goes on the
end of three foot horizontal top piece.

It is currently temporarily welded with 1/4" plate just holding it vertical
to the container. Mounted on a concrete rotator on bottom, and has a
masthead on top, negating the simple sliding of a square hole bearing like a
harrow bearing on from the end. I need to pass this vertical shaft through
some sort of bearing for a 360 swing, then weld a bracket over to the
container to secure it.

Any ideas about how to do this without taking it off, cutting it, putting
bearing on, welding it back together, and reinstalling it?

This davit is held off the side of the container about a foot, and is for
light lifting in and out of the pickup. I would like to have good rotation
on it on ball bearings. The best thing seems to be a harrow bearing with a
square center, just trying to find an alternative without taking the whole
heavy thing down.

But by the time I do all this fabbing, it would probably be less work just
taking it down and doing it the right way.

Steve