There is no shortage of articles and videos about installing SNS bindings onto skis. I watched a few such videos, and all of them were missing precision. Some said that the binding needs to be aligned at the ski’s balance point, others – 1 cm behind it. Most instructions don’t specify the drill bit diameter, and those that do, disagree with each other. It took me a while to locate the official word on installing the bindings.What you are looking for is a PDF file called Salomon Technical Manual Nordic. I only found the 2011 edition in a downloadable form, but there is a 2014 edition that can only be viewed in the browser. I am sure that the main concepts stay constant year to year. For example, all bindings in the 2011 edition are specified to have screw diameters of 6.3mm.
I am not going to duplicate the information found in many other online instructions, but will concentrate on what I thought was missing from them. My takeaway from reading the PDF were two points below.