upper latch holding bottom latch

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Following parts are required to add the bottom rod and latch to the 98/9927-LBR device.  Bottom Rod: 050515 for 9827 and 050514 for 9927 (specify finish)  Bottom Latch Assembly: 05009...
Check the adjustment and if this does not resolve then you may possibly have a defective center case or bottom latch.
Required top and bottom rod adjustment. Top rod possibly is adjusted too short and not lifting the rod far enough to engage the latch retention which would cause bottom rod to drag floor ...
Installation should be 6" from bottom of the door. See attached templates as reference.  T-5494 for HM Doors W-5494 for Wood Doors
The part number for 98/9927 bottom latch less cover is 050401-00 and the latch case cover is 050566-xx.
050090 for bottom latch retrofit kit and 050091 for top latch retrofit kit.
The internal rods and latches for the 25-C carried over from the older 18-C device so they can be used interchangeably.
See below for commonly requested dimensions on the MA lock.  Dimensions not found in other literature have a square around them. CL refers to "Centerline".