(continued) ingress door instructions: u (continued) egress door instructions: A clearance hole for the anti-rotational screw must be drilled into the door frame before mounting the switch module; its position is given on the templates. For anti-tamper purposes, the switch module has two sites for an anti-rotational threaded stud; only one site will be used depending on which installation plan is chosen. Thread the screw into hole until about 1/4" of the screw remains outside the module.