The problem you can run into with the Hinging Tool is that it has two blades, which is a good idea, but you must be careful. If a piece of balsa gets between the blades when you start it into the wood, the blades will spread as you plunge the blades in, making two seperate slots. If you are useing the Hinging Tool you should first start the slot with a #11 blade. I already had a Dremel Multi Tool which works great for making my hinge slots. But, if anyone is going to use a Multi Tool for hinging, you have to hold down your control surface fairly well because, unlike the GP tool, the Multi tool only has one blade and it's vibrating back and forth as you push it in. The GP tool has counter acting blades, so there isen't so much movement of the control surface.