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