Stabilized ‘snake spine’

Please notice that the inventory and the building instructions are for only two vertebra, not six as in the pictures.

The stabilized spine is asymmetrical in the sense that it bends quite a lot in one direction and not or only a little in the other. I wondered what a more symmetrical version could look like. Here is a spine that one could use for a snake-like model. It has some features and disadvantages:

It’s still asymmetrical ( see the pictures below ), but the difference between bending in one direction and the other is much smaller, than in the ‘stabilized spine’

As with the stabilized spine you can decide to reduce the amount of friction by removing the extra friction connector ( part 41678 ). The spine will be able to bend a little further in one direction and becomes more symmetrical.
This demo spine uses another technique to attach the glider axles to the vertebra
The gliding axles are pointing inwards (into the central axis of the spine) instead of outwards ( away from the center )
Because of the previous point, the overall model can be rather narrow, hence the ‘snake’ in the title
There is asymmetry in the amount of friction ( i.e. stability ) between bending two vertebra in one direction compared to the other.
The vertebra are rather long, but I don’t see any way to make them shorter while keeping the gliding axle pointing inwards.