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