In the various installations shown in FIGS 18 to 25, the lengths of the covers may vary considerably, depending on the concepts of {HEAD ~ the tooling} and {TAIL ~ stocking} 
In the various installations shown in FIGS 18 to 25 , the lengths of the covers may vary considerably , depending on the concepts of { HEAD ~ the tooling } and { TAIL ~ stocking }
OTH 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 TAIL TAIL TAIL TAIL TAIL