Quote: The UCA is redesigned so the upper ball joint is plumb when used with taller knuckles.
I don't think I understand this. Unless you mean that the UCA ia a touch longer than stock so that the ball joint won't "overangle" as claimed by Ebooger. Of course no one has proven that to be a problem and I believe Dulcich did a little research into ball joint angles and pretty much concluded that wasn't an issue.
