I've posted this other places but should have added it here too. These adjustable UCA's took the avatar from being able to make a full pass at the track maybe about 60% of the time to a car that goes dead straight eery time. They solved a serious lack of positive caster problem for me.
Little wheelies and almost 120 mph passes - I don't have to think or worry about these parts that have been on the car for over 2-1/2 years. They've seen more street driving too than you'd expect from a car like this (another 50 mile round trip to a cruise coming up this weekend!) I have not had any of the jam nuts come loose and the parts look like the day I put them on. Would I do them again from Peter? 100% ABSOLUTELY!!
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Note that the avatar (72 Demon) has the 73+ front disc brake setup.