At least two frame engaging members of the frame support structure are then moved to position side members of {TAIL ~ the frame} to {HEAD ~ a desired configuration} 
At least two frame engaging members of the frame support structure are then moved to position side members of { TAIL ~ the frame } to { HEAD ~ a desired configuration }
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD