The ball bearing is the wrong size!
The installed ball bearing measures 10*4, but it needs 10*5
And like the other review said, the rotating part is not balanced. You need to balance it your self with putty or similarNicely made and nicely finished, as it comes out of the box not useable.
In Australia this device would be deemed not fit for purpose, why do you ask, because Trackstar do not balance the pivoting end with the balance bubble, the balance bubble side is so much heavier than the other side of the bar it would be impossible to put a car on it to check the tweak because the bubble side wants to go down and applies excessive upward pressure on the other wheel.
I have always been happy with the products that I have purchased from this company, not with this one because now I have to try and balance this thing, does anybody in Hobbyking product test this stuff? if the postage costs were not so high I would return it.
I do think that I can balance it, but it should still come out of the Factory in a useable state, not good enough Trackstar