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