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