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Everyone has a RoboCup now a days. Why not utilize it better and more fully. Equiped with two spaces to hold the standard Preston Batteries and one larger space that fits an Altoids tin. It also has two places perfect to hook your glasses, sunglasses, or anything else you want hook onto the attachment.
Slide this attachement straight up from the bottom of the left cup holder. Swivel the attachment til it hooks into the side holes securely.