{HEAD ~ Each} of the lower slide bars employ a roller bearing {TAIL ~ member} while the upper slide bar utilizes a low friction bushing 
{ HEAD ~ Each } of the lower slide bars employ a roller bearing { TAIL ~ member } while the upper slide bar utilizes a low friction bushing
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH