Lathem LX100 - Manual (Page 22)

Lathem Security Solutions
Page 22
6. If the axle and pillars fit, you may elect to keep your current
latch in place or remove it and replace with the latch
included. To expand latch for larger door hole, hold front of
latch with one hand and pull on center axle hub. Make sure
that latch slope faces the same direction the door closes.
Secure with 2 small latch screws provided.
7. Place Exterior handle on door: Guide wire thru door hole
over top of latch assembly. Place connecting pillars thru
latch holes and axle thru center hole. Make sure the dot is
still up on the axle turning hub.