Ha-ha ! That brings back some memories ! When I was young, we used to take a front tire off my Mom's '73 460 Lincoln and stick a spring under the frame and let it down. Forget the car they were going on, an old Fairlane probably, but I remember I had to get a couple neighbor buddies to sit on the fender too, to get them to compress enough !! Then we wrapped it with some special packing tape my sister's boyfriend gave us. He swore it would hold !!! It did. After I started wrenching for a living, I worked for a guy that did not have a strut compressor. He had us compress the struts by raising the inground lift, and then stick the bottom of the strut in a crack/divot in the floor and letting the lift down on a plate he torched a hole in, on the top of the strut. Tricky process, controlling the lift drop with the air pressure. But, it worked,