The floating hinging point is formed through {HEAD ~ two ball bearings} , a fastening bolt , a coupling ring , a bearing house , an intermediate ring and {TAIL ~ a self locking nut}  
The floating hinging point is formed through { HEAD ~ two ball bearings } , a fastening bolt , a coupling ring , a bearing house , an intermediate ring and { TAIL ~ a self locking nut }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH