{HEAD ~ The center roller} and the first edge roller are rotatably supported on {TAIL ~ a common axis} 
rotatably supported on
{ HEAD ~ The center roller } and the first edge roller are rotatably supported on { TAIL ~ a common axis }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL