How can the Von Duprin 98/9975-L with 996L classroom trim function be converted as a night latch function in field?

The following steps are required to convert the Von Duprin 98/9975L from classroom to night latch function:

  • Order new 996L-NL-M trim and reset NL drive screw in mortise lockbody as set from factory per the following steps. 
  • Pull lockbody out of door.
  • Place lockbody in front of you with latchbolt facing left.
  • Insert right index finger inside mortise lockbody through cylinder hole cutout and feel for end of NL cam.
  • Lift up on NL cam until screw head is visible through NL drive screw hole on side of lockcase just below cylinder hole.
  • Turn screw counter clockwise until screw does not rotate any further.  

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