310 320 330 340 until the cradle is in a substantially level position while the arms 310 320 330 340 are in the raised position next the swivel plate 740 can be twisted clockwise or counter clockwise in the direction of arrow swp so that the side holes 743 747 are positioned directly adjacent to side edges on opposite sides of the upper end 328 of the arm 320 when the level orientation position of the cradle is reached the user may drill through the existing side holes 743 747 into plate 720 and then attach bolts through holes 743 747 where the heads of the bolts 750 effectively lock the orientation of the cradle relative to the lift arms 310 320 330 340 in an alternate embodiment and as illustrated with reference to fig2 and 27 the swivel mount assembly 700 a may comprise a swivel mount 752 mounted to a free end of the arm 320 for fixing the cradle 400 at a preselected orientation the swivel mount 752 may comprises a swivel plate 754 having a fastener 756 securing the arm 320 in a preselected orientation relative to the cradle 400 a swivel adjustment member 758 may include a rotatable plate 760 pivotal about a pivot pin 762 connected to the swivel plate 754 an adjustable fitting 764 provides adjusting means for rotating the rotatable plate 760 about the pivot pin 762 using a threaded bolt 766 moveable against a flange 768 carried by the swivel plate 754 by way of example caliper styled screw and the like for modifying the preselected orientation by a rotation of the rotatable plate 760 relative to the swivel plate 754 and this providing an orientation.