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