The hook is operatively connected to {HEAD ~ a power jack} in such a manner that, upon actuation of the power jack, the frame is pulled toward the slat engaged by the hook thereby causing {TAIL ~ the carpet} to be pulled by the prong members toward the adjacent wall edge 
The hook is operatively connected to { HEAD ~ a power jack } in such a manner that , upon actuation of the power jack , the frame is pulled toward the slat engaged by the hook thereby causing { TAIL ~ the carpet } to be pulled by the prong members toward the adjacent wall edge
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH