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Graham,
I was more intrigued by there lightweight sandwich design and weather it actually works or not. I have been over the CN forums and found a few interesting posts on them, however no information on the lightweight versions. Though based on completed listings it would seem they are selling. To date I have only seen the Conical design that allows reduction of the weight, I am just curious what the underlying design is here and how it works.
Regards
Fahim
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