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