The Real Grade line uses Bandai’s Advanced MS Joint frame, which I’m sure most everyone is familiar with by now. This frame is somewhat flexible but also, being small and having joints molded into it, fragile. If you mishandle something or exert pressure at the wrong place and angle it could damage the frame or break it entirely. Because of this Bandai is quite thorough in the instruction manual for the transformation sequence. If you follow the steps carefully, following along to the diagrams in the manual, you should be able to transform your Zeta without incident.