A-22 Cam ArmCaracteristicas: Either original equipment in the Comet drive clutches or a popular replacement for trail riding or racing 102 C, 108 C and 108 EXP clutches all use the same basic cam arm 108 4 PRO clutches use FOUR cam arms. (To find the required cam arm weight, add the weight of three cam arms used in a 108 EXP or other three post clutch, add 14%, then divide by FOUR. This will give you the required new cam arm weight.) When ordering cam arms for a