Well, I am still waiting on parts for the truck so I have been experimenting with ways to slew the crane I want to put on the back of the truck.
This is the third attempt, first attempt was using a old grinder head, disregarded due to weakness, second attempt, pushbike crankshaft, disregarded.
Third attempt, lazy susan bearing & pushbike sproket.
setting bearing to crane base plate
sprocket tacked to bearing & crane baseplate
mounted to truck (no chain, or slew motor yet)
base of crane on truck