The inner periphery of each intermediate ring is formed with an axis eccentric with respect to {HEAD ~ the axis} of {TAIL ~ the casing} 
of
The inner periphery of each intermediate ring is formed with an axis eccentric with respect to { HEAD ~ the axis } of { TAIL ~ the casing }
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