The plastic nub piece is a press on that holds the body ON, if yours is cracked then thats why the body fall off. The robots body rotates all the time that it is powered ON if working right. there are a lot of videos of the robot in operation on youtube, here is just one.
So are we talking the 1980's? I have alot of the small plastic robots featured on some of the links you posted Joe but I don't know that they are Bruder toys. At least the Robotic Probe Pod has a name and manufacture now.
I was given this space toy today that is made in West Germany, so I am thinking it must be from before the wall came down or it would not say west Germany. The guy said he thought it was a robot, but it could be a space toy. there is a wheel on the bottom that turns when you push it and that makes the head / antenna thingy spin around. Any one have an more information on it ?
With all the tins used to make custom robots by Henk and others, here is a tin that already comes with the artwork. found on this web site.
I don't think there will be any robots at all. could not load there video, so I could be wrong.
USA Network presents MR. ROBOT, a psychological thriller that follows Elliot (Rami Malek, 24), a young programmer, who works as a cyber-security engineer by day and a vigilante hacker by night. Elliot finds himself at a crossroads when the mysterious leader (Christian Slater, The Adderall Diaries) of an underground hacker group recruits him to destroy the firm he is paid to protect. Compelled by his personal beliefs, Elliot struggles to resist the chance to take down the multinational CEOs he believes are running (and ruining) the world. This contemporary and culturally resonant drama also stars Portia Doubleday (Her), Carly Chaikin (Suburgatory) andMartin Wallström (Easy Money III).