Solution to the wobbling stem
I had this issue on my sons ES2, and found a solution. I designed and 3D printed a spanner which can be used to tighten the stem nuts without taking anything apart, as the one you need to tighten is recessed in the stem which makes access with a normal spanner impossible.
If anyone needs this I can provide the 3D printer file, or potentially print you one and provide some instructions.
There is a bit of a knack to doing it as you have to loosen the locking nut fully then tighten the nut beneath a bit at a time before backing up the locking nut as that gets turned at the same time, however its very easy and completely eliminated the play in the stem.
Full disclosure, I have not ridden the scooter yet but can feel the play is gone, the tool is not ultra strong as its 3D printed ABS so you can only really finger tighten the nut, although this seems enough, and you could probably break the tool if you tightened excessively.
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