identify my latch

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The date of manufacture printed on the chassis cover (see below), will determine if you have a revised or old chassis. Chassis manufactured mid-June 2013 will have the new improvements. The first...
For T locks shipping mid-June 2013, the new latch can be identified by viewing the deadlatch profile. The profile of the deadlatch has changed from a "full moon" to a "half-moon". See figure below....
The AL-Series has four distinguishable parts that can help in lock identification.     1.   The AL-Series will have a castle nut holding the chassis on the ...
Here are some of the major differences between the M and MA-Series.  Lever mounting post holes -  Locations have changed on door template.  (12 and 6 o'clock for M lock, MA lock is approx 1 and...