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.
*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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