wherein said {TAIL ~ slide faces} form medial portions which contain said {HEAD ~ hydrostatic bearings} and are substantially part cylindrical with said first radius around said first axis, 
wherein said { TAIL ~ slide faces } form medial portions which contain said { HEAD ~ hydrostatic bearings } and are substantially part cylindrical with said first radius around said first axis ,
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH