Add three wheels and lock nuts from step 2.
If the washer between the bearings moves off center and you can't get the axle through, just use a pen tip or small screwdriver to push it back in place.
Tighten the nut with an 8mm wrench and 3mm Allen wrench.
Make sure the wheel can spin without being loose or so tight that the bearings feel like they are grinding.
Confirm the black mark on the offset spacer is correctly positioned after you tighten the lock nut.
Repeat for the other 2 carriages.
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