Im running the HPI Aluminum knuckles on the front for carpet foam setup. For some reason I am breaking the ball end right at the neck section right off the screw when I tap a board. And I mean "tap" very lightly. I consider myself a decent driver and In my last qual last night barely touched the corner and it blew for the 3rd straight qual, placed last overall last night, finished 4th A last week... so yeah... need to know if anyone else ever had the same problem. The screw is inserted through the knuckle from the bottom, in the outer most hole, and then the ball end is threaded on tight, but once I tap they snap at the neck right off. Any ideas.....? Thanks If pics would help let me know I will try and get some up....