DIY Prop--How to Make Thor's Hammer, Mjolnir. The second edition of my Avengers series of props, in. on Pinterest. | See more about Thor hammer tattoo, Thor symbol and Hammer of thor. It's sad that you have to search " Thor's Hammer " when you want to find. If you use a different hammer make sure the head is hollow. Arduino Pro Mini 5V - Don't forget, you'll need an appropriate FTDI cable to program this board!.