My number of restarts made me realise that i didn’t have the designed gameplay although it was similar apart from an extra autopilot and a MAT. Then found the designed gameplay that was neater than mine. Took a few attempts to get the ball running to where i wanted it to finish but it was fun adjusting the height of B.
The tricky moves of the beginning were the most clever & fun ones... I had a small difference in the balls order that (fortunately) did not have effect... thanks @Meko Guy well done!