My Tribute was set at 71lbs and 28" draw, just took a look at it and I only have 2 screws holding the module to the cam.

There is a place for a 3rd screw but it does not line up with the threaded hole in the cam.

It is possible that the 1/2 inch makes a difference and why only 2 screws are needed, but thats only a guess. My bow came from the factory this way, the dealer did nothing cept set up my add-ons.

You can always call Bowtech and ask their tech support at 541-284-4711.