Hey y'all, I have a piece of cast iron tubing. It's 1/8" wall, 1.1/4" diameter, has a 3/8" wide x 1 1/2" long slot machined into it. I need to know the most efficient way to do a nice looking, heavy chamfer on the outside of the slot. The chamfer should extend to the bottom edge of the slot and the top of the slot will measure 1/2" wide when finished. Cosmetic appearance is a must. What's y'all's thoughts on this matter?