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shaani-
They use a plain threaded axle with no shoulders for the bearing to sit on. This means axial loads are not so well supported and it also allows the bearings to be over preloaded on setup. The come nuts sleeve inside the bearing (so the bearing has a flat surface to sit on rather than thread) meaning the bearings are smaller than could otherwise be used.
M_V
Miche have IMO a flawed design where there is nothing supporting the bearing from the inside so my recommendation would be to avoid them.