great job!!! i make some of my own tools also, i would suggest useing stainless bolts as the steel can sometimes stain the leather black. regular small or jewlers files will cut stainless bolts just fine if you want to cross hatch and such. These are easy to make also lifters, modeling tool and stylus made with stainless all thread and brass nuts, i used leather washers for handles.
i chuck them up in a drill and turn them against my grinding belt to get the nice taper.