The bifurcated upper end of the vertical leg of the support arm is connected to {HEAD ~ the upper end} of {TAIL ~ the feed arm} 22 by means of an upper layer feed rod 37 
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The bifurcated upper end of the vertical leg of the support arm is connected to { HEAD ~ the upper end } of { TAIL ~ the feed arm } 22 by means of an upper layer feed rod 37
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH