What are the holes in the latches of my 1900 and 3600 cases for?
These holes are a tamper proof feature of the case. The case can be locked by installing screws into the openings. The type of screw to be used is a 3.0mm x 6.0mm long Socket Head Cap Screw (SCHS) which uses a 2.5mm hex wrench. Tamper-proof fasteners can be ordered from www.brycefastener.com or other suppliers.