ok so I've made 2 balisongs (butterfly knives) so far, which are much better than store bought I've been told, but I never can cut the grove in the handles as even and straight as I like. I only have basic tools like a pessicion mini lathe, pessicion drill press, angle grinder, and a dremel to work with. Does anyone have any suggestions on how I can get a straight, even, and centered groove in a 1/2" steel bar? thanx