I just installed the 3.5 pins, and that is a must do on this rig. As I pulled out the old front arms and pins, sure enough the pins were all bent up. Part #'s are TKR 6544B, 7225B, and 6523. Not to expensive, and easy to do. I bought mine from AMain and used their box to prop it up, how cool is that! Took 15-20 minutes. Those 3 mm are just to weak for this little beast.