The flange 30 may be provided on the exterior of the curve, and may have approximately four apertures 32 spaced along {HEAD ~ the length} of {TAIL ~ the flange} 
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The flange 30 may be provided on the exterior of the curve , and may have approximately four apertures 32 spaced along { HEAD ~ the length } of { TAIL ~ the flange }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL