Also, in some cases {HEAD ~ a polymer layer} is situated between the annular core and {TAIL ~ the cover}, whereby rotation between the cover and the core is reduced 
is situated between
Also , in some cases { HEAD ~ a polymer layer } is situated between the annular core and { TAIL ~ the cover } , whereby rotation between the cover and the core is reduced
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH