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For the lower support, aluminum extrusion with printed brackets holding its ends to the carbon tubes. The brackets have its seems tangential to the ends of the carbon tube so it may be pulled out easily. The aluminum has another components which acts as a guide to the axis pivot. This support is responsible for holding the weight of the assembly. It is integral that the printed bracket on the carbon and a firm hold; not susceptible to vibration induced shifting.
The brackets have its seems tangential to the ends of the carbon tube so it may be pulled out easily.