How do I Add angles properly. (SOLVED)

Hello!

I wan't to make a tank type thing, but i'm having trouble with something i'm guessing has to be really simple, but i can't seem to solve it.

The cannon moves freely. But when i'm moving the base and not the cannon, I want it to maintain the angle it had, relative to the angle of the base.

https://dl.dropboxusercontent.com/u/206 ... ngles.capx

It's like what the pin behavior does, but i wanna know the math =(

Do these help?

https://www.scirra.com/tutorials/729/ba ... mated-tank

or

https://www.scirra.com/tutorials/136/mo ... ependently

Something like this?

https://dl.dropboxusercontent.com/u/485 ... ollow.capx

— thanks, but that part I had already covered =)

LittleStain, hey that's it! i see I wasn't so far off xP. Thanks once again =)