A method for attaching a drive rod to a knife includes: forming a knife having proximal and distal ends； forming an aperture within the proximal end of the knife, the aperture including a series of fins disposed therein； weaving a distal end of a knife rod through the series of fins in an alternating manner； and engaging a cap onto the distal end of the knife drive rod to secure the knife drive rod within the aperture of the knife.
