Which needle/cartridge should I use for filling in color? I currently have round liner and shaders and use a dragonhawk machine. I tried to use to round liner for my own tattoo but it took a very long time and was causing some more skin damage than I’m used to as I kept having to go over the same areas so many times. Should I use a shader or is there a different type I should buy to finish it and to use in the future?