To make a tattoo gun, you need to remove the eraser from a mechanical pencil. Punch a hole all the way through the center with a large needle. Use a pair of pliers to bend one end of the needle into a 90-degree angle. Separate the tip of the mechanical pencil from pencil body and slide it down. Tape the pencil with duct tape and practice using the gun.
take out the motor of an old casset player with the wires. cut a pen tube to fit a needle. a guitar string is good for that. take out the ball of the ball point pen and clean out the pen ink. then attatch the pen tube to the motor this u do by using a plastic L bracket small one. u use a rubber band to mount the motor on top and some tape to mount the pen tube on the bottom part of the L bracket so it lines up with the bottom of the motor. make sure the wheele mount is lined up to the hole of the pen tube. then take an eraser from a pencil. cut it in half and press the eraser to the wheele mount that sticks out of the motor so it is tight but spins with the mount. when the motor is turned on that wheele(eraser will spin real fast.) then take ur sharppend needle. guitar string that should only be about 3-4 inches long and bend the non pointed end about a 1/4 of an inch down and make it perfectly square. u then slide the pointed end down the tube and into the barrel of the ball point pen and stick the end u bent down into the needle. then ur ready to go. attatch the wires to 2 AA batteries poz to poz neg to neg and u got power. and can start tattooing. i ran one of those for 10 years. love it. have fun. :)