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