Coil Tattoo Machine Contact Screws & Binding Screws - Looking for high-quality replacement screws for your coil tattoo machine? We offer contact screws and binding screws crafted from your choice of conductive brass or copper. We also carry an assortment of binding post sets to give you all the component parts you need to replace the binding post assembly on your coil tattoo machine. (Tip: Consider filing down the point of your contact screw for maximum contact with your front spring.)