Kinetic Base for BB-8
The front hatch is closed by gravity; therefore, the BB-8 should be tilted a bit backward. If the hatch gets stuck when closing, try adjusting the angle of the trans blue spear brick (27257).
The parts list contains the additional parts only, and most of them, including pneumatic parts, were taken from LEGO 42053 Volvo EW 160E.
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