Description
- A set of gears, shafts, and round hole ball bearings that can be set to a gear ratio (3.7:1) between the high speed gear and the super speed gear.
Just replace the counter (green) gear.
Easy to change.
● To change from a non-super speed gear to a 3.7:1 gear ratio, replace the spur gear built into the shaft with the spur gear (yellow) from this set. increase.
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