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@wreck
I think the main problem is that they aren't machined very well inside, so they don't sit on the spindle as well as they should. I had that problem too, I've also found that the bolt works itself loose very easily and regularly (not sure if this is the cranksets fault or not, but never had the same problem with other cranks). Also from when I first fitted them I noticed that the crank arms aren't level when I look at it from the side.