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