Here's a more specific example i threw together in Blender. Just a simple see-saw, you pull the left down, right goes up, pull the right down, left goes up. How i would i go about rigging something like that? Is my mock-up close? In this example, one half of the top part copies the rotation of the other part and inverts…
Use bones but set influence on whole elements - for example, the top arm bone has its pivot aligned on the screws, and influences all the metal parts of the top arm, with a soft fallof on the cable.