Seriously, HA whirl comes with a friggin huge rail gun thingy and there's no way for him to use it? Unacceptable, but fixable. Here's an easy solution that won't force you to sacrifice anything you don't want to. One, Take this lego piece out of your collection. It is the one thing you'll need to sacrifice. I know the picture isn't the greatest, but it's one of those that attach via the brick based ratchet joints. The end is wide and has a small hole that goes through it. Basically, that hole is perfect for the pegs on Whirl's arms. Two, Cut off the ratchet joint connectors and glue it onto the side of the rail gun via superglue. Three, post onto your HA whirl. Any questions? No. Shoulder can still move freely and your HA whirl looks just that much more awesome.