Hello TT Community and welcome to my first post.
I want to share a solution to puzzle 46 that flips the bits in order from left to right even though it was not a requirement of the puzzle. The trick here was the getting the third bit to kick off the processing on the red side. I used gear bits (the most fun part I think!) to set the state of the rightmost gear bit. The issue was that if bit one was zero, it would flip the second gear bit, so three were required which were set up so that bit one and bit two always hit the first two gear bits leaving the third gear bit in position to dump the next ball to hit it to the red side. It uses a few extra pieces (38 including the starter pieces) than the book solution.
The solution screen shot is from the Jesse Crossen TT simulator.