a 9mm socket or wrench. Figured this out tonight as i was installing mine
![Cheesy :D](https://board.marlincrawler.com/Smileys/marlin/grin.gif)
Didnt have time to wait on my E12 from marlin to get to the house and then get shipped to me....just be careful becuase if you torque them tightly enough, it will slip and strip the head off of them. so only use it in a pinch
![Cheesy :D](https://board.marlincrawler.com/Smileys/marlin/grin.gif)
just thought i would let you all know
![Wink ;)](https://board.marlincrawler.com/Smileys/marlin/wink.gif)