what codes dictate that lever returns are required?

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This is in regards to the California State Reference Code, (Formerly Title 19, California State Fire Marshal Standard) stating that all levers with returns comply; levers must return to within 1/2"...
Issue: One or both levers don't stay horizontal and droop down.Facts: Falcon T series locks in a high use application.Cause: Weak or broken springs within the springcage.Solution: Replacement sprin...
Falcon is reintroducing the lever return spring for the discontinued Falcon M mortise series.  Effective November 1, 2014 the lever return spring is now available for purchase with a list pric...
See Falcon MA lever assembly below: The spring mechanism (E) returns the lever to horizontal.  The parts are not sold separate, so if the lever sags, the entire lever assembly shoul...
Lever assemblies part numbers are found in the Pricebook.  Note they are handed.
These parts are no longer available.  For reference the spring part number is 4841 and the clip part number is 4326.