![](https://cdn.hackaday.io/images/8717141507995275643.jpg)
The downward forces on the bearings are not great so everyday ball roller type should be fine as they will sustain an axial force of about 20% of the radial forces. I'm not quite sure what will happen when they start to where down as currently there's no provision for adjustment.
![](https://cdn.hackaday.io/images/1506691507995882903.jpg)
The transmission shaft looks similar to the above but is a straight 25mm OD as it has support bearings right up close to the actual wheel and consequentially much less leverage force compared to the steering.
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