I put together a little information on the cruise control servos used in E34's. I put together some pictures and diagrams. Here is where you can download the pdf Cruise Control Actuator - Technical Information

This is my first draft. I plan to include a few more pictures involving how to remove the actuator from a 540i. Please let me know what you think, (i.e. what's missing? mistakes? what should I do to make it better? etc.) On the other hand, maybe not so many care about the internals of these devices (they just happened to catch my fancy...)

Hope you find it useful!