Building stuff securely at a 45 degree angle

So, first off, sorry for the pic quality, I just snapped a few quick pictures off my laptop screen rather than taking screenshots and then logging in on my laptop browser to post. Anyways, I'm trying to build Makuta, inspired by both the GWP Tahu and his appearance in the Bionicle Mask of Light movie, and I'm trying to get these two technic ball socket bricks attached to each other at this 45 degree angle for use in the ankle. Now, I know I can use that hinge piece to get the angle on the...