UPDATED from the video above
After some troubleshooting, adjusting, and anger… I solved this by discharging the powersupply and mainboard… Stupid of me to not just unplug everything at once. The vibrations are gone as well somehow… the new spindle is noisy, seems a bit more solid.
A bit strange to use deep groove ball bearings, but maybe the axial load is not high enough to require angular contact bearings?
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