Tom from SWISCO responded:
September 19, 2022
Hello! It definitely sounds like your mortise lock is the source of the issue. When the mortise starts hanging up, it takes more and more force for the thumb lever to actually throw it. Eventually the thumb lever will snap right off. Fortunately, we sell both. My recommendations to start out would be the 82-265 mortise and 82-107 thumb lever. Look these two products over and let me know if you had any questions. We also have a video on the 82-265 that may be of interest to you. Alternate image for 82-265
Dimensions for 82-107
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