There is a tool called "Broken Pin Extractor". It is a reverse threaded cup which fit over the pin, a tuning hammer turns the extractor and\the threads grip the pin. Or drive them trough the block if possible, drill a hole in the support block for the pin to discharge. Do not reuse the old, weakened pins. More will break. The holes are now enlarged from their removal as well. Replace with larger diameter pins. -- Regards, Jon Page
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