The spool and {HEAD ~ ratchet wheel} can be extruded as {TAIL ~ a one piece construction} 
extruded as
The spool and { HEAD ~ ratchet wheel } can be extruded as { TAIL ~ a one piece construction }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL