Mission Engineering Hex key size?

[gatgod77]

as the title says,my Mission engineering ep1 has gone very loose but I dont have and know the size of the hex key I need to tighten it,
I've googled and havn't found anything,
does anyone know?

 

[guitarnerdswe]

The size of the hex screw on my Aero is 7/64. I assume that the size is the same on the EP1, but don't take my word for it. I bought a long hex screwdriver, otherwise I couldn't reach it. Those regular L-shaped ones aren't long enough.