If the overhang is getting larger or smaller, move the back end of the 1x4 down or up, respectively, to correct the problem. Screw in the crosspiece with pocket screws to support the floorboards.
A is a leg, to the top of which one end of the table is rigidly secured. A is connected by a crosspiece, C, to another leg, B, the upper half of which, B', is movable on a hinge and has a groove ...