In {TAIL ~ other embodiments}, {HEAD ~ the coil restraints} are attached in each trough along the length of the trough 
In { TAIL ~ other embodiments } , { HEAD ~ the coil restraints } are attached in each trough along the length of the trough
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH