{HEAD ~ The free lengths} of the finished springs may be controlled by applying {TAIL ~ axial forces} during heat hardening 
controlled by applying
{ HEAD ~ The free lengths } of the finished springs may be controlled by applying { TAIL ~ axial forces } during heat hardening
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH