yeah, mine came loose loads when the locking grub screw was on the right hand side of the car (car facing forward), irrespective of whether the grub screw was tightened to holy hell or not.
Moving the locking grub screw to the left hand side, and I never ever had that problem again. Back of the net!
Whether this is right or not, it worked for me, so it's worth a try.
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