I have disassembled the Jac and have a question regarding the position of washers on the internal screw assembly. The top of the screw assembly has a square 1/4 inch thick steel plate with dimple holes around the center. I think the holes should be on the downside. There is a thin washer also and I assume it should be on top of the plate. Happijac does not offer a equipment schematic. Anyone out there who can help me?? dave