Two opposite sides of the holding portion extend perpendicularly to form a pair of {HEAD ~ opposite stabilizing wings} locating at {TAIL ~ a same side} as the buckling slice with respect to the holding portion 
locating at
Two opposite sides of the holding portion extend perpendicularly to form a pair of { HEAD ~ opposite stabilizing wings } locating at { TAIL ~ a same side } as the buckling slice with respect to the holding portion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH