What thread are the sticks on the 8s?

Hey all, I'm looking to either buy or make some more gripps sticks for my 8s but need to know what the thread is. Does anyone know what it is or if another brand of stick fits?

Thanks!

Edit: It seems they are 3mm but I can't find out the pitch yet.

Edit 2: .5mm thread pitch

If they're the same as the devo7E, then it's a standard M3 thread.

I use the ones from Spektrum, available in orange and black, 24mm or 34mm length. They are giving really good grip, as they are killer-pointy at the business-end.

See here

Thanks for the link!