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Dreaded distributor Pin

Hi Guy's.
I decided to go for a drive with my son in the few minutes of dry weather we've had in the UK in the last 3 months and low and behold the dreaded pin in the dizzy broke, my son initially thought something severe had happened to the engine as after a back fire a loud metallic noise was heard by both of us but fortunately just the pin.
I am a little confused as to why the pin actually broke because I think the back fire came AFTER the pin broke and not before.
My first thoughts were something caught in the oil pump but unless a small piece on metal is stuck in the engine, I can't find anything in the oil, I think the timing may have been out, now set to 18 degrees and the car seems to pull a little better.
Can anyone shed any light as to why this may have happened could it be that time has simply made the pin brittle (it was double pinned) and I have also double pinned the new one. The dizzy is a Petronix II and although the engine was built around 1999 very few miles few added in the years since.
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