The particular hobbyist seems to be a quite a bit more talented than the docta.
Look what he says about the Scorpions construction:
"The first motor I bought was an HK5, a new series. The "new" model is an HK II, a bit older. The quality of the HK 5 was far superior. The worst thing about the HK II is the different gap between the stator and the bell housing, which is clearly visible to the naked eye. I hope my center piece will be better. I'm going to install 16mm ball bearings instead of the 19mm ones, because the bearing glued into the stator is a complete nonsense in my opinion."
~Turbo Pete~
The fixture he made is really cool too....











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