Re: Radius ball cap
My car had the rubber ball style and never gave me any trouble. I decided to put a new rubber on when I pulled the transmission and was surprised to see that the ball measured a perfectly round 1.5".
I suspect that is why I never had a problem with it, the rubber was nicely compressed in the caps and didn't have a small oblong radius ball bouncing around and wearing it out. Because of that I'm the odd man out that actually likes the rubber ball setup. I do think that either setup requires a correctly shaped full size radius ball though.
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