First off I'm not 100 percent sure this isnt going to ruin a perfectly good club. I wouldn't be using a drill bit at all, the club already has grooves, all you want to do is deepen them and sharpen the edges. For that I would be using a Dremel tool and some of their small grinding wheels. Run the grinding wheel up and down the existing grooves, just how much and how deep you want the grooves is up to you. Like I said I'm not sure if this is going to adversely affect the club or not. If it works don't recommend me to anybody else please...
