I think i have already messed up, i bought a new 06 parker frontier bow, didnt know anything about marking the cam, been reading up on articles about tuning a new bow, after about 100 shots the string and cables will streatch and the specs wont be the same, and the bow will half to be tuned and the cam timing will half to be set, only thing i didnt make any markings on my cam, before i started shooting it, probably been shot close to a 100 times, are they any way now i can tell if the cam timing is off, and what do i need to do.....thanks alot