No touch device

The objective of this design was to find a way to make a contactless device that, with relative simplicity, solves the maximum of common circumstances that require direct contact of the hands, for example, driving a shopping cart. Speaking of hands, i think it is evident that the mechanism is inspired by a "success story" of Nature :-)) The thumb / index gripper mechanism of our hand.

Extra materials:
-4 Countersunk Screws Ø3mm (Length + - 9mm)
-1 Steel ball Ø8mm
-1 Spring for Ø5mm hole

Note that this is the first approach to the concept. In case anyone has an interest in modifying the design, a STEP file is included.

Thanks, Enjoy!