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So. No big deal. The .01mm variation in the grub screws. These you adjust to the minimum depth plus or minus a thousand. Test the wheel spin, and look at the depth by eye.
The bearings you learn to spin by 1/16ths turns of the grub screw. Eventually your eye is trained and these go together fast, with excellent results.
The variation in the steel and chrome axles, you get used to. Some bearings slide on, others do not. Keep a tray of the bearings out 200 of them, and pick out one of 20 to 30 will fit. It’s something in manufacturing for sure. Drawn metal with electroplated chrome. The inside diameter of the bearings are equally off by .005 plus or minus.
These small variations, eventually the bearings go on the axles, and then you fit the grub screws, and test spin.
That’s all. Nothing too complicated.