It maybe the contactoris are not well connected, we could adjust the contact post a little, if it still could not work after being adjusted, it maybe the tattoo machine itself leak or short circuit.. Where should the rubber bands be placed on the tattoo gun? wikihow contributor. community answer. if the machine doesn't work you should try readjusting the contact point screw. if you want to set up your tattoo machine, consider buying a starter kit that contains everything you need to get started.. Dragonhawk silver tattoo needles. round liner tattoo needles; round shader tattoo needles; dragonhawk tattoo machines guns for shader work wq4455; product was successfully added to your shopping cart. go to cart page continue dragonhawk tattoo machines guns for shader work wq4455. 6 review(s) | add your review..