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To @mrmhead.

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1. Firstly, all that I can say about PART 3 of our first video is that the described-there mechanical phenomenon has been proved experimentally many (may be thousands of) times. The “X effect” exists no matter how small/big is the value of the force of friction inside the zig-zag channels. The “X effect” does not depend on the value of force of friction inside the zigzag channels. (Please refer to our previous posts, if you like.)
2. Secondly, you wrote: “And why are there two sides of each apparatus?  Couldn’t the same be demonstrated with one straight pipe and one zig-zag pipe?” Well, your idea seems to be an interesting variation and an original further development of the zig-zag concept. Yes, what would really happen, if we use one straight pipe and one zig-zag pipe? I don’t know. It’s worth to think over this variation. Wouldn’t the one zig-zag pipe generate some large and low-frequency amplitude while the ball moves inside the zig-zag channels? Would the one zig-zag tube motion be straight-line and costant? What do you think? Let us consider carefully and thoroughly your suggestion.