The invention provides means for accurately aligning the valve stem bearings by mounting them on {HEAD ~ a precisely machined replica} of the valve and stem and placing them in the unmachined or only rough machined openings in {TAIL ~ the housing} and while so supported in precise alignment on the replica stem locking them in place by injection molding rubber around them 
The invention provides means for accurately aligning the valve stem bearings by mounting them on { HEAD ~ a precisely machined replica } of the valve and stem and placing them in the unmachined or only rough machined openings in { TAIL ~ the housing } and while so supported in precise alignment on the replica stem locking them in place by injection molding rubber around them
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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