• Screw on 7 speed or cassette? If it's a cassette then use a shimano whatever 8/9/10 and a spacer for the cassette, if it's screw on there are plenty of cheap hubs about. If the axle is solid and cup cone and threaded you can probably find a hollow qr one the same thread and swap that out and reuse the same cones which would be easiest.

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