As with the previously described embodiment, means are provided for allowing relative movement of {TAIL ~ reservoir} 2 and {HEAD ~ trough} 28 between the various mounted positions illustrated in FIGS 4a, 4b and 4c 
As with the previously described embodiment , means are provided for allowing relative movement of { TAIL ~ reservoir } 2 and { HEAD ~ trough } 28 between the various mounted positions illustrated in FIGS 4a , 4b and 4c
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH