A method of assembling an end effector for a surgical instrument includes: assembling first and second jaw members within a clevis disposed at a distal end of an outer drive shaft of a surgical instrument； inserting an end of a pivot pin including a stop on the opposite end thereof through a hole defined in a first outer wall of the clevis, through pivot bores defined within the first and second jaw members, and through a hole defined in a second outer wall of the clevis to expose a portion of the end of the pivot pin relative to the clevis； and melting the exposed portion of the end of the pivot pin to form a second stop and secure the first and second jaw members within the clevis.
