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