of a tab 63 the backer plate cover 59 is connected to the backer plate body not shown here with a living hinge 65 the male wing member 37 fig2 can have an elongate mounting slot 67 in its face for mounting to a fixed member such as a chassis housing wall or jamb this slot elongation compensates for any misalignment because the pivot pin 69 is rigidly projecting from the male wing member 39 s cylindrical boss like structure 51 and a flat abutment face 71 surrounds the pin 69 the male wing member 37 and female wing member 35 are reasonably rotationally joined when the pivot pin 69 is fully seated when a micro switch not shown here is added to the hinge assembly 31 a trip finger 73 is added to extend from the end of the male wing member 37 with this trip finger 73 fig2 rotating with the male wing member and being adjacent to the mounting area defined by the mounting holes 45 fig1 for installations where misalignment is not an issue the male wing member 37 fastener mounting hole can be round 67 a fig3 a pair of bayonet type hooks 75 77 extend on diametrically opposite sides of the pivot pin 69 fig2 3 these hooks 75 77 have pliable flat ribbon shaped shafts 79 81 respectively and their heads project beyond the outside.