Dave Sr. from SWISCO responded:
December 4, 2013
It sounds like it might be a problem with the inside mortise lock, not the thumb latch. I don't think that problem can be repaired. I recommend removing the thumb latch completely and manually testing the lock with a screwdriver to see if it's still malfunctioning. If so, check out our 82-037 and see if this matches your existing lock. Make sure to carefully compare all the dimensions we show to your own hardware.
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