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@Butters
You can rebuild a Vamo. There's a video on YouTube of a guy in some sort of factory doing it. Might shed some light on how to fix yours.
Problem with the Roller must be to do with the positive pin not making contact with the atty? It's adjustable isn't it? The Kayfun is defo not adjustable + pin.
Maybe this one in the east:
http://www.theguardian.com/uk-news/2014/mar/19/london-first-e-cigarette-coffee-shop-vape-lab
London prices by the sounds of it.