The extremely long and slow autopilot keeps stopping at the same point. One clockwise lap then another anti-clockwise lap then B stops near the slider.
Would have been more enjoyable if the autopilot was not so slow. The mechanism was also worryingly slow to rise but it did what I expected. I was tapping the wrong block the first two times B stopped.
Spoiler: Amended spoiler tips Raise the slider, tap the grass,lower the slider then be very patient. Can take over 10 seconds to start