{HEAD ~ A small roller} 50 is mounted from {TAIL ~ the cross bar} 51 of the U shaped guide bar 48, with the bracket 52 mounted on the cross bar 51, L shaped stem extending from the bracket 52 downwardly adjacent the leg 49 of the U shaped guide bar 48, and with the roller 50 rotatably mounted on leg 55 of the L shaped stem 54 
{ HEAD ~ A small roller } 50 is mounted from { TAIL ~ the cross bar } 51 of the U shaped guide bar 48 , with the bracket 52 mounted on the cross bar 51 , L shaped stem extending from the bracket 52 downwardly adjacent the leg 49 of the U shaped guide bar 48 , and with the roller 50 rotatably mounted on leg 55 of the L shaped stem 54
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH