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