invention will now be described access to the interior of certain housings 10 such as an electronic lock housing must be highly securable to prevent access by intruders yet must be readily available to provide access for maintenance or repairs thus an access opening 12 is typically provided on the front of the housing a cover or hatch 14 see fig2 is usually provided to close the opening the hatch seats on flanges that protrude into the opening but are recessed from the surface of the housing at least two seating flanges 16 are provided on the housing access opening one edge 18 of the opening in the housing is flangeless the hatch also has a single inwardly recessed flange 20 on one edge that is insertable behind the flangeless edge of the opening the hatch 14 is dimensioned so that it fits flush in the opening when closed a mechanism for securing one other edge of the hatch will now be described a substantially flat cantilevered leaf spring 22 is attached to the hatch the spring is anchored on one end by a raised boss 24 that holds it parallel to the back surface of the hatch the spring has a v shaped catch 26 at the cantilever end the second member of the securing device is a lever 28 pivotally attached to the housing the lever pivots about a pin 29 that permits the free end of the lever to rotate through a small arc the lever as.