Love the packable and lightweight Fourth Arrow system but wish you could LOCK your base to your shoulder? We have your solution! A Fourth Arrow Cam Lever.
With the standard thumbscrew and wing nut there is a small amount of movement at the shoulder/base connection. This is normal as the cutout of the base has to be just large enough to accept the shoulder but not so large that it is loose.
The cam lever can replace the thumb screws/wingnuts on Stiff Arms, Carbon Arms, and Stiff Arm Pros. Though slightly more difficult to fit through the base it locks the shoulder/base connection and eliminates any possible movement!