Mounted on {HEAD ~ the shaft} 30 is {TAIL ~ a viewing or telescopic apparatus V} having a base plate 50 welded or otherwise secured to the shaft 30 
Mounted on { HEAD ~ the shaft } 30 is { TAIL ~ a viewing or telescopic apparatus V } having a base plate 50 welded or otherwise secured to the shaft 30
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH