passes between the plates 50 52 and through boss 55 on the rod 46 to pivotally connect the rod to the mast the rod 46 slides within a cylinder 56 that is located between a pair of walls 58 60 that form part of the base 12 each of the walls 58 60 has a cam track indicated at 62 formed in it that controls relative movement between the cylinder 56 and base 12 a connector in the form of a bolt 64 is connected to the cylinder and extends to either side into the cam track 62 the cam track 62 has a lower closed end 65 and pair of notches 66 68 respectively formed in the lower edge of the track the end 65 and notches 66 68 form apertures to receive the bolt 64 at different pivotal positions of the mast on the base the notch 66 is located at the mid point of the cam track 62 and is dimensioned to be able to receive the bolt 64 and maintain it in a stable position the notch 68 is located at the upper end of the cam track 62 and similarly is dimensioned to receive the bolt 64 in a stable location the end 65 and notches 66 68 provide three abutments for transferring load from the actuator 44 to the base 12 a strut 70 is connected to the mast 14 through a clevis 72 located immediately above the clevis 48 the strut 70 is connected to the clevis 72 by a pin 74 and the lower end of.