A weight container, which includes an adjustable calibrating bellow including two outer ribs and at least one inner rib; wherein the outer ribs may collapse and fold around the inner rib; a locking apparatus located adjacent to one outer rib; and a cover receiving apparatus located adjacent to the other outer rib. The optical system support is a ceramic optical system support. The pivot pins having multiple nubs and holes with detents can hold the bin steady at a desired angle.