In the store they have a machine to cut aluminum mini blinds to width. Naturally since I am replacing blinds on a boat it isn't that simple. The blinds match a window shape that is ВЅ a trapezoid on one side. So I need to cut the top rail to one length and the bottom rail several inches wider and all the slats in between at incrementally longer widths corresponding to their position on the blind. The store can only cut sides parallel and various blind shops also don't have a clue. Boat blinds specialty shops are a zillion dollars more than HD or wallyworld.