• if it runs a threaded multifreewheel rather than a cassette, just get however-many-tooth freewheel to stick on, potentially you may need to rearrange chainrings to create a suitable chainline, shorten the chain to tension, use the limiter screws on the front mech (if not entirely seized) to create a kind of chainguide to stop the chain coming off the chosen chainring, and that should essentially be job done

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