For use with Model D and E RowErgs. This is a long elastic shock cord (or bungee cord) that recoils the chain on recovery. If your chain recoils slowly—or not at all—between strokes, then you should inspect your existing shock cord. If the shock cord is not badly worn, frayed or broken, you may be able to correct the recoil problem by adjusting the shock cord. If the shock cord is badly worn or broken, you should replace it.