Now, pardon me but I'm not sure the terminology and names of all the parts on Robby yet. The 6 valves in the head I think are called saxton valves but not sure. Today while working on a project at work, I had a brainstorm how to computerize those valves to get them to pulsate like in the movie at random times.
I designed a fairly simple method to open and close the valves under control of the robotic control module. When I got home from work tonight, I mounted a motor in the head and assembled the required parts to make it happen. It's going to be a busy weekend but I think I'll have time to get it going this weekend. Fun stuff.