YOU'LL HAVE TO HAVE SOMEONE YOU KNOW SHOW YOU CUZ I CAN'T REALLY EXPLAIN OVER THE INTERNET BUT THE BASIC MATERIALS YOU'LL NEED ARE A PLASTIC PEN (BIC OR WHATEVER), A SMALL ELEC. MOTOR (LIKE OFF OF THEM LOWRIDER MODELS), A PAPER CLIP, AN ERASER, SOME GUITAR STRING (FOR THE NEEDLE) AND A SHITLOAD OF TAPE. OH YEA, AND A BATTERY TOO. HOLLOW OUT THE PEN, THEN FIX THE MOTOR TO ONE END AND FIX THE PAPER CLIP TO THE MOTOR AND THE GUITAR STRING TO THE PAPER CLIP SO THAT WHEN IT SPINS, THE GUITAR STRING BOBS UP AND DOWN. NO I AM NOT AN ARTIST AND YES I DID JUST WHIP THIS PIC UP ON THE 'PAINT' PROGRAM, NEVERTHELESS, I HOPE I WAS SOME HELP, THIS IS THE ONLY WAY I KNOW HOW TO MAKE A TAT GUN