Set of propulsion weights and thread for acceleration of sliders on air-cushion track. Consisting of 3 S-shaped hooks, 1 g, 5 S-shaped hooks, 2 g, and 1 roll of sewing thread.
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Plaited hemp string on a bobbin. For a variety of uses, e.g. setting up block and tackle using pulleys U30020 to U30027 or making a pendulum with bobs U30035.
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