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So I got an old GoBot action figure called Rube that's part of the Puzzler combiner. The problem is his head is stuck in the slide down position. I want to slide his head up but I don't want to use a lot of force on the plastic for fear of breaking him. I would leave his head down but I need it up to attach him to the leg of the Puzzler. Studying his counterpart ZigZag whose head can slide up, I see some rust stains on the plastic. Any ideas on how to not break an old toy with moving plastic parts?