Supposedly the N64 rumble pack is huge with prison tattoo artists. A maximum security prison guard recently wrote.
"It is actually pretty easy. There are no workshops in maximum security. They do it in their rooms with a battery(power) taped to a tube(could be a pen or a tightly wound piece of paper). The motor from the rumble pack is taken out and attached to the top of the tube. A needle or pin is run down the middle of the tube. when "on" the needle will move up and down like a sewing machine. The needle is then dipped in "ink." This is made a number of ways the easiest is to use ball point pen ink, but they could use other items to get different colors or looks."