{HEAD ~ A hollow compensating spool} is slidably arranged within {TAIL ~ the hollow cage} between the cross sectional holes 
is slidably arranged within
{ HEAD ~ A hollow compensating spool } is slidably arranged within { TAIL ~ the hollow cage } between the cross sectional holes
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH