The third arm has at least one resiliently deformable lobe section between its distal and proximal ends to allow {HEAD ~ movement} of the proximal end relative to {TAIL ~ the distal end} of the third arm 
relative to
The third arm has at least one resiliently deformable lobe section between its distal and proximal ends to allow { HEAD ~ movement } of the proximal end relative to { TAIL ~ the distal end } of the third arm
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH