You could go visit an engineering company, have the pivot holes enlarged and then a bearing shim fitted. There's probably enough meat on the pivots.
Autotech on the haverscroft industrial estate, that's ought to be not far from you do some bike based work and might be worth talking to but you may well find it cheaper to get a used swinging arm.
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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