Advantageously, the relative stacking motion is stopped by {HEAD ~ the abutment} of 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 
Advantageously , the relative stacking motion is stopped by { HEAD ~ the abutment } of 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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH 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