It was my understanding that the benefit of replacing those end bushings with heim joints was to remove the binding and subsequent snap-release under load. The GT40 suspension design is similar in many aspects to the Mangusta but is fully heim jointed and works rather well. My old GT40 replica had some heims and some bushings and I replaced all the bushings with heim-joints. The difference was astonishing. Completely predictable and no snap response under extreme conditions.
Mark
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