{HEAD ~ A sprocket} 64 having {TAIL ~ a plurality} of teeth 66 is fixedly attached to an outer surface of the first plate 56 , the sprocket 64 having a diameter smaller than a diameter of the first plate 56 
having
{ HEAD ~ A sprocket } 64 having { TAIL ~ a plurality } of teeth 66 is fixedly attached to an outer surface of the first plate 56 , the sprocket 64 having a diameter smaller than a diameter of the first plate 56
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH