At your own risk.
It sounded amazing but it broke.
Speed was increased to double by tweaking the resistor near the variable speed resistor on the circuit board.
For doubling again a pulley of larger diameter was made and put on the motor.
It is not really recommended. The previous pulley is so tight that by removing it the motor is almost destroyed becoming noisy etc. A special extractor needs to made or used.
Experiment was abandoned after the great sound and the mechanism breaking.
It is felt it should be much better not doing any pulley mod.
Perhaps speed can be increased by increasing further the voltage to the motor.
At your own risk.
This will give it more power too.
Will it overheat?
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