Rods 110, 110 preferably are made from a stiff resilient material, to resist {TAIL ~ both lateral bending} as well as axial twisting from {HEAD ~ torsional forces} 
Rods 110 , 110 preferably are made from a stiff resilient material , to resist { TAIL ~ both lateral bending } as well as axial twisting from { HEAD ~ torsional forces }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD