Took the 900 out for a 2 hour ride and 30 miles from home heard three clanging noises from the front than the front tire starts to rub against something and than hum. First I thought it was a flat but than realized something else was wrong so i pulled over and it looks like something fell off from the front tire. On the right side where the axle sticks through the shock, the axle has a hole in it indicating that something is supposed to go in there. I assume this is what is causing my problem. First I thought it was a cotter pin but the hole is probably 1/2 inch in diameter. Anyone have an idea what is supposed to go in there? My guess is that it is supposed to keep the wheel in place.