A chain repairing tool, which includes a tool body and a PBR block, which is configured for pressing side plates of chain links, for breaking chain links and for riveting chain links as the PBR block is variously oriented within the tool body of the chain repairing tool. Also, a chain repairing tool, having a tool body, a body bolt, which is threadably received by the tool body, and a breaking pin where the body bolt includes a tapered passage, which guides the breaking pin. Also, the breaking pin includes a domed head. Also, a PBR block, which is configured for pressing side plates of chain links, for breaking chain links and for riveting chain links as said PBR block is variously oriented, in conjunction with a chain repairing tool.