Here are the instructions for changing the combination on your model 643D lock. This lock is preset at the factory to operate at 0-0-0-0. 1  With dials at 0-0-0-0, pull out the shackle. 2  Turn shackle 90 degree (1/4 turn) so notch on shackle is aligned with notch in lock body. 3  Press and hold the shackle down.
(A building is usually referred to as 'the barracks' instead of 'a barrack.') In some prisons, housing units not consisting of cell blocks are referred to as barracks.<br /><br />Barrack is also used as a verb meaning to provide temporary housing.
This article is about the military fortification. For other uses, see Bunker (disambiguation). A bunker is a defensive military fortification designed to protect people or valued materials from falling bombs or other attacks. Bunkers are mostly underground, compared to blockhouses which are mostly above ground.