In a hot knife assembly having {TAIL ~ a cylindrical tube} surrounding a resistance heater for heating {HEAD ~ the knife} the improvement comprising: 
In a hot knife assembly having { TAIL ~ a cylindrical tube } surrounding a resistance heater for heating { HEAD ~ the knife } the improvement comprising :
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH