[MENTION=8480]thorco3[/MENTION] i use 94/95 mustang mirrors since they are already smooth. I then looked at a set of cobra mirrors to get a line of reference. I marked it off with a pencil and played with my line to where I liked it. Once I got it where I did want it, I use a dremil with a really small bit to get my line. Once I was happy with that I then, took the same bit and dug in about half the thickness of the mirror. Once I finished that I used a fatter head for the dremil to both widen and shape the groove to be more of a even valley so to say. Once I had the groove uniform all the way around, II scuffed the whole mirror and shot the body side in flat black and the mirror in gloss black. Wish I would have done it in Matte black