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