In a recent renovation, I kind of* invented something: the $5 house jack. Using two pieces of material — in this case: composite decking (with good compressive strength) — and some common hardware, we were able to lift the beam holding the house, the 1/2in necessary to install a secondary support post. Check it out.
[The house jack in action ... below a cut-to-size 4X4 post]
(* props to both the Egyptians and Greeks who probably did something like this first, but in the context of MCM renovation, it's a nice "reinvention", perhaps)