Do NOT put a washer on the threaded end of the bolt. Put the washer on the HEAD of the bolt and insert it all the way into the hitch pin hole.Thread the ZeroWobble+ barrel nut with handle onto the bolt (with no washer). Make sure the barrel nut recesses into the hitch pin hole until it stops against the MotoTote tube inside the hitch. This is critical to eliminating any shake by clamping the square tube to the hitch.Tighten the bolt with a socket wrench while holding the handle on the nut with your other hand until the connection to the hitch is solid with no play. Do not over-tighten.For geeks: Max torque 55 ft-lbsNOTE: You WILL be able to lift the end of the square tube straight up. This is normal but there should be no rotational movement.