Z bar alignment

I'm surprised this has not been mentioned yet. Is the inside of the z-bar worn out. Even with new bushings, the bar will slip off the ball studs if the tube is worn on the inside. When you take the z-bar off, just look at the ball studs and see if they are pointing straight. Then inspect the inside of the z-bar because any wear will cause a problem. Call Brewers performance and explain your situation. I'm sure they can help.