I have a bolt in my spare parts box, it looks near identical to my rear axle bolt. It does not have a cotter pin on it. Did the later XR600r's or 650L's ever come with an axle without that pin? Reason being I need a hollow axle for axle sliders, my 89 axle is solid . This new bolt is hollow... Do I run the risk of it backing out without the cotter pin? I ride all street BTW.