Abstract: Two panels are assembled to form a housing by a face-to-face junction. Locking members are operated in pairs, with a first locking member of a pair operated to enable operation of the second locking member, which is preliminarily stopped before point of completion by contact with a pressure-alterable restriction. Hand pressure applied to the second locking member by-passes the restriction to complete assembly. One of the locking members can be readjusted using fasteners or is spring loaded to readjust itself when hand pressure is applied.