Extending upwardly of the base plate 51 is a pair of {HEAD ~ telescope} supporting members 54 between which a telescope 55 is pivotally mounted by {TAIL ~ a pivot shaft} 56 
Extending upwardly of the base plate 51 is a pair of { HEAD ~ telescope } supporting members 54 between which a telescope 55 is pivotally mounted by { TAIL ~ a pivot shaft } 56
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH