The springs 20 provide compliancy and overcome {HEAD ~ difficulties} associated with varying coefficients of {TAIL ~ thermal expansion}  
The springs 20 provide compliancy and overcome { HEAD ~ difficulties } associated with varying coefficients of { TAIL ~ thermal expansion }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH