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Dad turns his from bright steel bar, he also has to clean up the casting of the drum so it is parallel and then they get pressed on.
Speedy wheels for example sell nylon ones to fit cars, I think the idea is mainly for when the nuts are done up to locate the wheel properly, as there should be enough friction to prevent any movement once everything is right.
Cheers
Will
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A 3D print will be costly unless you have your own printer.
Any engineering shop should be able to knock them up for you. Tyre and wheel shops should also have them.
