an arm carrying said dip ring at a first point and mounted for {HEAD ~ movement} about {TAIL ~ a first axis} passing through said arm at a second point 
about
an arm carrying said dip ring at a first point and mounted for { HEAD ~ movement } about { TAIL ~ a first axis } passing through said arm at a second point
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH