An apparatus and a method for managing a storage space through time-variant consumption estimation. The novel handlebar mounting device includes a pivot arm having a pivot base and a coupler interface with therebetween a pivot joint having an adjustable rotational stiffness. Each station can identify an item of waste, determine the most appropriate container for the item, and facilitate disposal of the item in the appropriate container. A flowable substance is passed into the cavity and permitted to solidify to establish fusion in the cavity.