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· Opel fan
357 Posts
I had a 70 that used to do that, I put the ends of the nut in a vice and put enough pressure on them to make the end of the nut slightly oblong, that kept them from loosening up again. I don't know if this is a very good solution but it lasted long enough to make it to the next maintenance of valve adjustment with out loosening and causing tapping. HTH
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