Removable insert for a threshing rotor cage

An agricultural harvester, comprising:

• a chassis;
• a cleaning system carried by the chassis and comprising at least one sieve and a tailings return elevator with an inlet located below the at least one sieve;
• and
• a threshing and separating system carried by the chassis and comprising:
• a rotor configured to rotate about a rotor axis;
• a rotor cage at least partially enclosing the rotor, the rotor cage comprising a tailings return inlet formed therein that comprises an angled guide lip coupled to the tailings return elevator and an insert opening formed therein that is at least partially circumferentially aligned with the tailings return inlet relative to the rotor axis;
• at least one concave coupled to the rotor cage and defining a plurality of concave perforations;
• and
• a threshing insert removably coupled to the rotor cage, the threshing insert at least partially covering the insert opening and being positioned such that material from the tailings return inlet travels past the threshing insert before reaching the concave.