Originally Posted by ChateauV10
Thanks for the details! Are the blocks held in with what look like two pins, side to side?
Also, what is the red cylinder thing mounted in the background of the one pic? Looks like it's parallel to the frame rails?
The pins are nothing special, a couple 1/8" pieces of SS rod that were crushed on one end (in a vise) and pushed into the pvc with loctite to hold the jack screw top captive. There is a littile wiggle room in the diameter and depth to allow slight self alignment and a a cutback radii at the vertex of the vertical and horizontal planes that was added after the initial machining. The angle piece of plastic trim needs somewhere to go when you tighten the jack. It will move as the corrugated compresses. I don't think wood would be a good material, it will crack. The PVC finished is 2 x 6 x 3 1/2. Without access to a bridgeport, you can probably get er done with a router. For the PVC material, try McMaster Carr or Grainger. Do your math on the measurements to put the center of the 1 7/8 hole for the jack's pad at the center of your fabricated I-beam, if that's what you've got. Then your forces will be in line.
The red cylinder is nothing special either... my TV is parked next to the TT. It's the rocker panel on my red truck!