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Topic - Grivel 360 screw thread upside down?

CurlyStevo - on 31 Oct 2012
On ice screws the ridge the thread consists of is not symmetrical, one side of the ridge is sloping and the other side is vertical.

Now to my mind BD have it the right way around. The vertical side is such that if you try and pull the scew out of the ice the vertical side is pushed against the ice. Grivel screws it's the other way around. Anyone know why?

http://www.google.co.uk/imgres?q=grivel+360&um=1&hl=en&sa=X&biw=1486&bih=770&...

http://www.google.co.uk/imgres?q=black+diamond+express&um=1&hl=en&biw=1486&bih=770&a...
Stevo
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