Material surface: 6061 aluminum, surface oxidation

Function: Turn the adjusting bolt to move the axle block forward or backward to adjust the chain tension.

Modification reasons: The original car is of ordinary style, and it is troublesome to adjust.

Advantages:

*Novel shape, enhance the appearance.

*Added L/R left and right marks and adjustment scale lines.

*The bolt and axle block can be moved at the same time for easy adjustment.

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