which one face is provided with a planar wall 40 which is relatively inset because of upper and lower step portion 48 this wall or bolt face 40 is provided with a trackway 42 medially disposed between the top and bottom step portions when inserted into the hole 4 this bolt face 40 addresses the hole 4 in the cylinder lock as shown in fig4 the locking mechanism is provided with a lock cylinder 34 and on its opposed faces a plurality of tumblers 36 in addition however along a circumference of the cylinder near the inner face 39 and parallel thereto is a groove 47 which acts as a guide and nesting area for the loaded keeper spring 37 axially offset from the longitudinal center of the circular inner face 39 is an outwardly extending cylinder pin 38 this pin when suitably assembled into the clevis section is meant to ride in the trackway 42 of the bolt latch 26 surrounding the cylinder 34 and fitted into the hole for the cylinder a cylinder sleeve 9 is provided the dimension of the sleeve 9 is such that it snugly engages the cylinder 34 and along opposed longitudinal faces thereof openings 41 have been provided to allow relative rotation of the cylinder when the tumblers have been properly retracted the cylinder 34 is constrained.