When the crosshead flexes, the position of the transverse seal relative to the inner circumference of the cylinder and {HEAD ~ hence the abutment} of {TAIL ~ the transverse seal} at the inner circumference are not changed 
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When the crosshead flexes , the position of the transverse seal relative to the inner circumference of the cylinder and { HEAD ~ hence the abutment } of { TAIL ~ the transverse seal } at the inner circumference are not changed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH