Abstract: The latch bolt assembly of this invention features a novel cam activating assembly which permits election of one of two door knob spindle backsets which are in standard usage without the need for substituting different operating assemblies or reversing door knob or spindle components. The cam activating assembly features two intersecting rotatably mounted cams which operate about two separate and parallel axes which are the centers of the two spindle backset in common industry usage and further the two cams form a common intersecting aperture for accepting the door knob spindle in one of the two predetermined backset positions. Each cam is capable of independently operating the latchbolt in either direction of rotation through radially extending cam ears which coact with the latch operating plate to convert the rotary motion of the cams to the reciprocating motion required to retract the bolt.