diameter of these counterbores is approximately 5 8 of inch subplate 25 is machined to have counterbores that correspond to counterbores 54 and 55 that is 54 39 and 55 39 counterbore 54 39 is substantially identical to counterbore 54 however counterbore 55 39 is oval to permit side to side movement rubber washers 31 are selected to fit into counterbores 54 54 39 55 and 55 39 o ring 32 is selected to fit into groove 56 and groove 58 groove 56 is machined into chassis 23 and groove 58 in subplate 25 leveling assembly 84 is held together via bolts 33 which are screwed into holes 64 section 86 is the pivot point for the windage adjustment section 88 allows subplate 25 to move left to right to correct for windage adjustment screw 21 urges against tab 70 causing subplate 25 to move either left or right counterbore 55 39 and the corresponding slot 90 is oval to permit subplate 25 to easily slide relative to chassis 23 to adjust elevation upward screw in rear adjustment screws 22 wherein screws 22 are urged against adjustment plates 74 in turn adjustment plates 74 compresses o ring 32 note that grooves 56 and 58 have a 45 degree shoulder which transforms the compressing into a vertical adjustment to adjust the elevation downward screw in forward adjustment screws 22 to remove laser module 10 from subplate 25 the operator depresses release levers 19 and slides module 10 along dovetail 92 levers 19 are locked around posts 76 held in place via spring 78 referring to fig5 infrared emitter 43 in laser module 10 communicates with an infrared detector not shown in flashlight module 12 which activates flashlight module 12 fig7 is a side view of the modular.