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