{HEAD ~ The mounting brackets 1A}, 1B are temporarily held in position by friction provoked by the resiliency of {TAIL ~ the flexible tongues} and arms helped by the relevant first, second, third and fourth detent projections 71, 73, 75 and 77 
{ HEAD ~ The mounting brackets 1A } , 1B are temporarily held in position by friction provoked by the resiliency of { TAIL ~ the flexible tongues } and arms helped by the relevant first , second , third and fourth detent projections 71 , 73 , 75 and 77
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH