I am going to reinstall an older cast iron tub in my daugters home and have a couple questions. This tub has the eqivalent of 'feet' on the bottom but about what seems strange to me is the feet are about 1.5 inches short of touching the ground with the tub sitting level. (the side of the tub is 19" deep, the legs come down to about 17.5". It looks like you should put 2X4s underneath to shim it but I would think they would compress some under the weight. The feet were not touching the ground when we took it out. It was supported by a leger board and the bottom edge of the tub. There also is nothing to use to attach it to walls. Is this tub held in place just by the weight? How do I install this tub?