{TAIL ~ The side members} are gripped by gripping means to maintain the side members along {HEAD ~ respective straight transverse axes} 
{ TAIL ~ The side members } are gripped by gripping means to maintain the side members along { HEAD ~ respective straight transverse axes }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD