Just a post script to add to my post above, now that I actually have my Sigma Max and have been using it: if you look at the image I posted above in the inset detail you will see a small raised square on the side of the runner - when you adjust the rail you simply get that section adjacent to the top of the rail - that corresponds to the 5-7mm spacing and no physical measurement is necessary, it's all done visually by aligning to that square (obviously you have a 'window' to accommodate the 5-7 range and can fine adjust this as you see fit while cutting your particular type of tile)
I have to say this Sigma is fabulous - a single score gives a perfect break on my hard Porcelain floor tiles - extremely clean edge! Really impressed with this cutter.
