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