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Mate, you always use a washer under a nut to increase the surface area of force being applied and to stop the nut pulling through the material that it is mounted on,in your case a soft metal like aluminium.
Did you bolt the tray to the crossbars?
Mate, you always use a washer under a nut to increase the surface area of force being applied and to stop the nut pulling through the material that it is mounted on,in your case a soft metal like aluminium.
Did you bolt the tray to the crossbars?