This thing is awesome. Just broke the cup off of one of them, and did this:
Think I'll keep the other as a cup!
re-painting mine a flat silver...and then dusting up with some black to get more accurate color!
Just a thought.. couldn't you use a heat gun on the inside of the cup, so it becomes soft, and will collapse easily? If you heat it from inside, that should also keep the outer manacle shell from heating up too much, I'd think.