{HEAD ~ The frame}, spool and ratchet wheel can be defined from {TAIL ~ aluminum alloy} 
defined from
{ HEAD ~ The frame } , spool and ratchet wheel can be defined from { TAIL ~ aluminum alloy }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL