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To @citizenschallengev3.

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Hi there,

1. About your post of June 23, 2021 at 9:04 am. Well, I do not understand very well what exactly do you mean. Would you explain again your concept?
2. About your post of June 23, 2021 at 9:09 am. Yes, I answered mrmhead’s question about the one-tube-one-ball construction. Please look at (a) my post of  June 19, 2021 at 4:10 am and at (b) my post of June 21, 2021 at 7:16 am. But there is still no answer from mrmhead about the one-tube-one-ball construction. (An obvious advantage of the one-tube-one-ball construction is its simplicity. A disadvantage seems to be a possible sophisticated curve-linear motion of both the ball and the zig-zag tube while the ball slides inside the zig-zag channels.)