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Looks like this might be the way to go.
An adapter will be no problem. Have made several in the past to enable power saw blades with different hub / hole sizes to be used on my power saw.
If I reacll, the hole in lifting weights is around 25 to 30mm. Should be no problem making a sleeve & also making some sort of locking mechanism.
I'm thinking of a externally threaded shaft 30mm longer than the thickness of the weight. A flange on 1 end to stop it pulling all the way through. A locking nut which will screw onto it & lock the shaft / spacer into the weight. Then a grub locking screw through the protruding section onto the original bar to keep the weight in place.
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