Advantageously, the relative stacking motion is stopped by the abutment of {HEAD ~ the lower cone knob} 30 on {TAIL ~ the upper cone interior surface} 52 before the upper cone has descended onto the lower cone sufficiently to create a jamming or sticking problem 
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Advantageously , the relative stacking motion is stopped by the abutment of { HEAD ~ the lower cone knob } 30 on { TAIL ~ the upper cone interior surface } 52 before the upper cone has descended onto the lower cone sufficiently to create a jamming or sticking problem
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL 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