The adjusting device 1 wherein {HEAD ~ said first engaging portion} is a rod and {TAIL ~ the second engaging portion} is two hook elements 
The adjusting device 1 wherein { HEAD ~ said first engaging portion } is a rod and { TAIL ~ the second engaging portion } is two hook elements
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH