A circuit board tester that uses a dual-stage translation to bring a unit under test (UUT) into physical and electric contact first with a series of tall probes, then with a series of short probes. Initially, the UUT is mounted on a support plate, and spaced apart from both the tall and short probes. First, in order to perform a functional test on the UUT, a first vacuum stage is engaged, and atmospheric pressure translates the UUT longitudinally until contact is made with a first hard stop, def...

A kingpin lock including a body having a substantially frustoconical portion and a kingpin cavity having a central axis, a slide channel having a central axis and a sleeve channel having a central axis. The slide channel intersects the kingpin cavity such that its central axis is substantially offset from a radius that extends outwardly from the central axis of the kingpin cavity. The sleeve channel intersects the slide channel. A slide member is shiftable between an engaged position extending p...