This gauge has {HEAD ~ a pair} of {TAIL ~ cylindrical sleeves} 41 and 42 that are shown in ion 
of
This gauge has { HEAD ~ a pair } of { TAIL ~ cylindrical sleeves } 41 and 42 that are shown in ion
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH