{HEAD ~ These inner rollers} 68 and 70 contact {TAIL ~ the inner side} 72 of the handrail 10 
contact
{ HEAD ~ These inner rollers } 68 and 70 contact { TAIL ~ the inner side } 72 of the handrail 10
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH