On 21/04/2015 Dave_S wrote:
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>Worth noting that while Arapiles rock can be very smooth and polished,
>it rarely ever forms perfectly parallel sided cracks. An undulation within
>the crack will stop any outward cam movement on even the slickest rock
>imaginable.
Somewhere in the length of that thread, someone states some physics for why an undulation won't actually stop a cam failing to grip on slick rock. I can't remember the argument at all though, you'd have to search for it, sorry ...
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