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I installed Acton's watts link on my Unique's jag rear and have been very pleased. Locating the top of the jag hub really stabilizes the rear under heavy power application.
I also had a different watts link setup installed on an early ERA I owned years ago. Completely eliminated the axle hop that car suffered from. Both cars had high horsepower and sticky tires, which I believe overstresses the stock jag hub locating design. When that happens, the hub tries to rotate around the big lower link. A top link to control horizontal movement at the top of the hub solves that problem.
I am not familiar with the Arntz rear arrangement, but a watts link has worked well with the jag rear for both the Unique and ERA.
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