My '72 VW had a distributor advance plate that was held steady by a spring pushing down on a single ball bearing (I swear this was the factory design). The spring broke, the vacuum advance made the plate wobble, and the dwell and timing turned bizarre. I made several springs out of steel and aluminum cans.
"The belief that there is only one truth, and that oneself is in possession of it, is the root of all evil in the world."-- Max Born, Nobel Physicist