Velux, why oh why do you not provide the T10 screwdriver with the product. I would imagine it would cost you next to nothing to buy these in bulk and then supply with the product. T10 screwdriver is not a tool that most people have (myself and all my neighbours included). To purchase one I had to take a two hour round trip to a DIY store. Not good enough Velux, think about your customers for the prices you charge you should ensure your customers have everything they need to fit the blind.