The disc is mounted to the shaft by a bearing which permits motion of the disc in {HEAD ~ rotation} about {TAIL ~ the shaft axis} and about axes transverse to the shaft axis 
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The disc is mounted to the shaft by a bearing which permits motion of the disc in { HEAD ~ rotation } about { TAIL ~ the shaft axis } and about axes transverse to the shaft axis
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH