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