Jim,
I built a support out of 5 to 6, 3ft lengths of 6"x4", under the basement, lowering corner with jacks,
evenly on to support column built, to sit firm on the three remaining jacks and support, then manually
wind up small amount of jack to be fixed, and un bolt & repair.
Purchase timber from lumber shop/salvage yard as required. Store 2-4 in Truck bed at sides, with TC for emergency use. Can be used, so as to not over extend camper jacks, base plates for changing tires for truck jack, chocks for wheels, or bed stops at rear of
Truck bed to prevent damage.
After fixing Jack, re-install, raise leg to tension, raise all legs slightly, then remove wooden supports.
Good Luck, Doug
