The arms for the conversion are designed to be run on the zx5, on the the zx5 the lower shock was mounted to the rear of the arm and the screw holding it on was part of the structure, so when the arms are fitted to the rb5 and the shocks mounted on the front a weak spot was created as the screw was no longer in the back and believe me i have broken the outer off of the arm when i converted mine before the worlds kit came out, i did not have the screw in, but since fitting the rest of the worlds kit and using those two screws(touches wood) i haven't broken one since and have had a few crashes that would surely have broken it off before.
HTH SimonW
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