{HEAD ~ A sensor} is held in a substantially fixed position relative to the insulation to measure {TAIL ~ force} exerted on the sensor by the insulation 
{ HEAD ~ A sensor } is held in a substantially fixed position relative to the insulation to measure { TAIL ~ force } exerted on the sensor by the insulation
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH