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Hello to all who are reading ths,

I recently aquired a second MP movie Starscream (out of box) and decided to put it out on display, however...
His head jams when pulling at his "breastplate" to activate the electronics.
When I let go, his mouth remains open.

Im an avid customizer and repainter, (although pale in comparison to most of the people on the site ;D).

Could anyone offer me a solution to this problem?

I have cracked the head open and shaved off some of the interior, this fixed the gap he had around the "golden nose" area, but his mouth isn't budging.

Any ideas?
Thanks in advance.