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For some reason the plastic that they used on the yokes of that era seems to turn to an ash like substance. I have been seeing yokes that look terrible work just fine since the early 80's. I still wonder what causes this since I have seen it for over 20 years in working sets, but I have NOS yokes in boxes that are the same age but are not deteriorated. The heating and cooling for years of use is the only thing I can think of that caused accelerated deterioration.
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