Motor stator was made of few turns if thick wire instead of many turns of thinner wire. The few turns reduces overall torque and increases chances of sparking.
The motor brush tips were not curved but straight hence more sparks and heating of rotor in less than 30seconds of Operation.
I tried to remove the main mounting screws to be able to sandpaper the brushes but the screw sheared as they were made of Aluminium or some other very light metal. Who even does that with mounting screws?Plus the 2 screws were glued in place.
The bottom bearing supports were made of thinner aluminium which cracked easily. I had to use epoxy to hold it back in place.
Fedex together with their customs officers were the worst as they charged me more than two times the price of the product as clearance fees.
I expected better from all parties but well... Life must go on.