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