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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Robin
What is the diameter of the shaft? Size of the gear/cog/pulley?
S&H might make cost prohibited, but Grainger for shaft keys.
https://www.grainger.com/category/key-stock/fasteners/ecatalog/N-8kl
The more I think about it, what about the local hardware store. Surely they might have keys or raw stock for pulley systems, garage door, garden tractor. Or, automotive, fan wheels, defroster etc. Bicycle shop. Blacksmith, forge, welder for welding rod, a machinist. Someone that repairs lawn mowers.
If low revs as @allObjects suggests, what about making your own key out of an aluminum can, by making several folds out of a strip? Although aluminum, it should work without slipping. Grind down a screw or nail.