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Look at the rub block on the points that failed - are they white or brown? Bosch made a batch of points with white material that didn't hold up (I interpret it as maybe a teflon impregnated nylon that wouldn't take the heat from friction or just cold flowed and took a set after time). The old points and the new good ones have a brown rub block (probably a cloth reinforced thermoset material like bakelite). Which ones failed in your application?
Jim
'73 911
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