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I wasn't happy with the arm range on iron factory's starscream, so I took an x-acto knife to his elbows to get rid of some excess plastic that was getting in the way. His right side is with it done, the left is without. One vertical cut on the grey plastic on the side, and two on each half of the blue part on the front. I'm pretty happy with the results, he gets way more range and the extra gap on the front is barely noticeable.
The whole thing took 5 minutes per arm, most of which was trying not the strip the screw that holds the forearm together. I'll probably do some sanding to clean up the front facing bit.