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