![]() If the modules get small as the numbers increase, you can assume larger numbers mean shorter draw lengths. So if the modules get bigger as the numbers increase, you can assume larger numbers mean longer draw lengths. That's why we use the penny to give scale to our module photographs. If you can't find any info on your bow at all, you can usually use this basic rule of thumb: the longer the leading edge of the module is, the longer the draw length it yields. Fortunately, there's another way to choose the right module. We know that's confusing, but we didn't engineer these bows - we just work here. Easy enough, but sometimes the numbering sequence works backwards, and every once in a while the sizing numbers do not even represent whole numbers in draw length yields. In this case, switching from a #4 module to a #6 module increases the bow's draw length by 2 inches. However, most modules sizes represent 1 inch draw length increments, with higher numbers often yielding longer draw lengths and lower numbers yielding shorter draw lengths. The only sure way to know what draw length a particular module will yield in any particular bow is to refer to the original specification chart for that exact model bow. It can be quite a mess to decipher into accurate fitment charts - at least when working from the module number backwards. To make it even more challenging, bow manufacturers often lease cam systems from one another, so sometimes a module for a brand X bow actually fits brand Y bows as well. A module that makes a 29" draw length in one bow, may make 30", or even 27.5" in another model. ![]() Over the years, some series of modules have been used in multiple bows (bow manufacturers tend to carry cam systems through multiple seasons and models). Please refer to the bow manufacturer module charts for fitment. These obsolete parts are from old production work stock (never sold to a consumer) and are sold as numbered pairs. If you are unsure which cam fits your compound bow, call the manufacturer first to double check.Obsession Archery, Binary (Hybrid) Cam Module Set, Size #8 w/Draw-Stop Peg Slot (Top +Bottom): Original factory draw length modules for older bows - HARD TO FIND! Modules are in new or excellent condition, but may show minor finish blemishes. Study these photos carefully before proceeding. These parts are only intended for sale as direct replacements for an existing bow. Attempting to retrofit cams with the wrong specifications is a catastrophe just waiting to happen. If you're thinking of trying to "upgrade" a bow by changing to a different cam style, don't it won't work. Attempting to create a "frankenbow" by deliberately installing an incorrect cam WILL TURN OUT BADLY and may cause serious injury. You MUST use the correct cam specifications for your particular bow. Changing cams is a difficult and dangerous job for the home enthusiast. ![]() SPECIAL WARNING! Make sure you know what you're doing. Otherwise, no additional hardware is included. Basically, you get exactly what is shown. If the cam(s) has modules, draw-stops or other hardware already installed (see photos) you will receive those parts as well. OEM Obsession Archery Defcon/Fusion 2-PC Cam Set, Size #8 (Top & Bottom): Original factory cam for Obsession Compound Bows (from recent work stock - never sold to a consumer). ![]()
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