heater cable

Here's a pic of the heater box. I'm sure i don't have the cables hooked up properly. As you can see in the pic, there's a cable clamp on the right hand side of the pic that isn't being used and i have no idea what pivot it goes to. The heat control cable is the one that the runs towards the back/right side and isn't hooked up to anything.

I never would have thought i'd have so much trouble figuring this one out!

Thanks for the suggestions!
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Here's one I took out of a '66 model.