the structure the rollers 90 are supported on roller axles 92 that are on an axis that is directed to the surface contact plate center of rotation 82 the surface contact plate 80 has attachment device openings around the periphery as shown the attachment devices 84 are shown in fig2 and 7 installed in the openings fig5 shows a top view of the turnaround with the drive access plate 66 as shown in fig1 removed this shows the arrangement of the drive mechanism installed in the drive mechanism support tray 54 including the battery 108 electric motor 70 worm gear 72 two sets of drive sprockets 73 and driven sprockets 74 or the equivalent in gears or belt drives and the surface contact plate 80 which is connected to the rotation shaft 88 which is connected to the frame by bearings 96 fig6 shows a cutaway side view of the turnaround on the axis shown in fig4 this shows the drive mechanism in relation to the rollers fig7 is an expanded view of the drive mechanism detail indicated in fig6 the drive mechanism transfers the high revolution per minute rpm speed of the electric motor 70 to a low rpm speed about 1 5 rpm.