Lathem ATX - Manual (Page 10)

ATX Installation and User’s Guide
Page 5
9. Install the Master ATX: Install the ATX in the same location
where the WWVB signal was received.
Mount the ATX
Drill a 5/16" hole.
Insert a wall anchor and tap flush to wall with a
hammer.
Insert a screw into the anchor leaving 1/8" exposed.
Align the keyhole on case back and slide onto the screw.
CONGRATULATIONS!!! Setup in Master mode is now complete