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Cam failure discussion 23-Apr-2015 At 11:49:47 PM Macciza

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James - I think its more a case that the springs help maintain friction at the cam/rock interface to hold it in place. Giving it a tug test that friction and if it is sufficient the cams will start expanding and it will hold, if the friction doesn't balance then the cams slide.
This is based on solid rock that doesn't deform. For some Blues sandstone testing it will help work out whether its going to blow too much rock out, or track; sometimes into a better set position.

Jezza - I think it shows that flared cracks are LESS likely to holding, in fact that as you increase the flare eventually it simply doesn't work and it falls out . . .
Not quite sure what you mean or how you concluded the other stuff, but I think it shows how the Direct Loading method means they hold better in even more flared cracks then normal Spring Loaded cams ...