FIG 5 illustrates a modified form of {HEAD ~ the invention} wherein the jack drive unit 27 is connected to a planetary gear drive 81 which connects to {TAIL ~ the shaft} 24 of the jack 
FIG 5 illustrates a modified form of { HEAD ~ the invention } wherein the jack drive unit 27 is connected to a planetary gear drive 81 which connects to { TAIL ~ the shaft } 24 of the jack
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH