Alternatively or in addition to the strap, tray or holder 32, the casings 14 may have an attachment means for directly attaching {HEAD ~ one casing} 14 to {TAIL ~ another} 
to
Alternatively or in addition to the strap , tray or holder 32 , the casings 14 may have an attachment means for directly attaching { HEAD ~ one casing } 14 to { TAIL ~ another }
OTH OTH 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 OTH REL TAIL TAIL TAIL TAIL TAIL