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