It's like with RoboCop, the arm can't support the weight of a diecast accessory, at least not for any significant length of time. If you can, go with the plastic version.
But the arm seems fine holding up the hammer. Which version did you have the issue with?
Plastic version?
Dark World version. It always has been like that. Just can't hold the diecast hammer for more than a minute. Very irritating as that is my favorite pose for him.
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