This two-step spool is used to make a powered winch with PASCO Structures. The spool is secured onto a Structures axle with the included anti-backlash screw. The axle passes through the two included plastic bearings that are screwed to the Structures connectors. These bearings ensure smooth rotation of the axle.

String can be wrapped around either step of the spool to explore the difference in speed and torque create by the different spool diameters.

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