Ling threaded rod, couple nuts, couple U brackets to hold the spring, old wheel bearing and a foot of ridgid conduit. Home made spring compressor. Worked OK, bent one of the lower spring holders, neeed to be of stronger material. I can take pics if anyone is really interisted, but it's the same theory as the other two gentlemen posted. That hole underhood is the key, a base sits there and the rod down through the spring with something to hold it from the inside and you simply screw it up. Pretty simple.
