There were two things I recall when I installed mine. I had to be careful with bolt length. You need to use grade 8 bolts that are as long as possible without bottoming out in the arm. Also, I think the holes in the knuckle are threaded. I don’t recall if I had to drill them slightly so the arm would tighten correctly. I do remember I installed it and then took it apart to double check it was tightening down right. I haven’t had any issues yet.
