This special attachment screw allows the Far-Sight base to be attached to T&T style parallelogram arms. These type of parallelogram arms do not have a 1/4"x20 screw extending up from the arm. The screw extends down through the base nut located in the bottom of the FAR-Sight to attach to the mount.

(This special screw is not required for most parallelogram or tripod mounting applications.)