Quote Originally Posted by GoktimusPrime View Post
That chest hole goes all the way through Galvatron in the film. I'm surprised Optimus Prime never exploited that by putting his arm right through it and attempting some serious grappling. By quite literally penetrating Galvatron's centre of mass, Optimus Prime would easily end that fight in seconds and Galvatron would be majorly screwed.
The chest hole cut his old sword in half when he stuck it in there, so I don't think it would be a good idea to stick his hand in there.

(it was probably why Optimus grabbed a new sword later... one that the writer probably wrote in as a significant plot element, but the Director failed to emphasise)