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There should be a sleeve or a bushing inside the tube ,the all thread likely destroyed it but bushings on these Chinese bikes are usually a sore spot to begin with .Take it apart ,using a long punch from the other side remove what's left of it ,then take some measurements and start searching .My next door neighbour runs a machine shop out of his garage ,perhaps you can find someone like him to take care of things ?Also ,ditch the all thread and go to a bolt supplier and buy a bolt for the pivot .
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