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