catch screw LV

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Screw part number is L583-485.  Screw type: 8-32 UC-2A W/#6 Flat truss head Phillips recess, header point.
- AD Series and CO series products require that the Night Latch (NL) screw is installed in the exit device.  Be sure this screw is installed- Exit hardware and strike must be properly mounted ...
Bad dogging hook on the dogging assembly could cause the 33A/35A and 98/99 exit device latch bolt not to retract completely.