A device supports the assembly from a support and a safety device loosely extends from {TAIL ~ a first channel} to {HEAD ~ the second channel} 
A device supports the assembly from a support and a safety device loosely extends from { TAIL ~ a first channel } to { HEAD ~ the second channel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD