You don't offer details about your problem.
It seems that MKS doesn't want people to fool with the pedals, which I understand because it's so easy to axially overload radial bearings.
However, if you have play, you might reach out to MKS. Or, you might see if you can open the end cap, under which you'll find a nut to take up axial play. If you decide to adjust them, be careful to only take up play, but not to create preload.
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