Hey people. Hope someone can help. Have 07 wr450 and front pads are very low. I unscrewed the little flat-head screw to get to the caliper pin. It has a hex head on it. I used a 5mm allen key and it sliped and rounded off the inside. When I put it in, it felt a bit loose. I tried a 5.5mm allen key and it wouldn't fit. Is it supposed to be a 5mm allen key or is it something else?