{HEAD ~ The compressing step} can be performed on {TAIL ~ the end} 11 of the heat pipe 1 before the heat pipe 1 is vacuumed and filled with the working fluid 
{ HEAD ~ The compressing step } can be performed on { TAIL ~ the end } 11 of the heat pipe 1 before the heat pipe 1 is vacuumed and filled with the working fluid
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL 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