Emergency release on privacy lock

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Question
Answer
A flat head screwdriver can be used or the 35-250 emergency key.
M504-271 is the emergency key used to open a locked S40.
The emergency keys are shipped with each lock.  The part numbers are; 61-509 standard and 61-510 large bow size.
Only the lever return spring is available.
Related solution: What is the part number for the lever return spring for the old M series mortise lock?