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