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