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