Assembling a BLDC motor [serious]

All the esk8 motors I have worked on used:

two 688ZZ bearings, 8mm⌀ x 16mm⌀ x 5mm
one 698ZZ bearing, 8mm⌀ x 19mm⌀ x 6mm

The last ones I obtained from here:

However, not all motors are the same.

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