Each of {TAIL ~ the support bearings} has a respective geometric center, while each of the transverse seals has an annular abutment surface engaging {HEAD ~ a respective annular contact surface} of the crosshead 
Each of { TAIL ~ the support bearings } has a respective geometric center , while each of the transverse seals has an annular abutment surface engaging { HEAD ~ a respective annular contact surface } of the crosshead
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 HEAD HEAD OTH OTH OTH