In this manner the bearings are free to float with respect to {HEAD ~ the stem openings} in the valve housing and thus maintain {TAIL ~ their precise alignment} with the stem irrespective of inaccuracies of the stem openings existing in the rough casting either before or after an initial rough machining 
In this manner the bearings are free to float with respect to { HEAD ~ the stem openings } in the valve housing and thus maintain { TAIL ~ their precise alignment } with the stem irrespective of inaccuracies of the stem openings existing in the rough casting either before or after an initial rough machining
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH