This follow focus allows the lever attached to the ring to be folded backwards, for example for storage, or to be dis-attached, in case it is not needed anymore (the geared ring could also be activated through another gear). The minimum lens diameter is 54mm. The advantage of this design is, that both the ring and lever use the same single screw required. The design is parametric and made in catia. The screw size is M3.The screw size is M3. Print parts and put them together as shown in the pictures.