{HEAD ~ A spool} extends between the first and second sidewalls and is rotatably supported in {TAIL ~ the first and second apertures} of the first and second sidewalls 
is rotatably supported in
{ HEAD ~ A spool } extends between the first and second sidewalls and is rotatably supported in { TAIL ~ the first and second apertures } of the first and second sidewalls
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH