This How-to should guilde you through the steps of upgrading your motorshafts to M5 threads.
Apply a bit of Loctite to the outter side of the motorshaft and push the threated adapter over the shaft of the motor
Wait for the Loctite to cure (in my case waiting about an hour did the job)
After the Loctite has cured screw the M5 nut almost all the way down (see picture 2)
Screw in the Propeller and counter it with the M5 nut (see picture 3)
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