Well. . . I was climbing a granite face with about a 3 1/2 ft ledge, i got the fronts up on the ledge, the left rear went into a dip, and as soon as the right rear started up the face i guess the left rear got more than fully extended and the coil went rolling down the mountain. i got up on the face, without the damn coil started driving heard some grinding i thought i had a flat then the guy behind me comes running up with my coil. got to flat ground and 30 mins later had the coil back in and was on my way.