A sprocket 64 having 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 {HEAD ~ a diameter} of {TAIL ~ the first plate} 56 
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A sprocket 64 having 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 { HEAD ~ a diameter } of { TAIL ~ the first plate } 56
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 HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH