Ok ok
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why would cone washers cause that?
are you hulk? 
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Maybe lol. They are super thin on the bottom 
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how about some star shaped ones
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Lovely I am adding it to first post.
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@fessyfoo, The counterbore ones have sharp corners, hence stress concentration when tightened and also the thinner base makes it easy to break. See pic below
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that actually made sense on second read. thanks.