I've heard the same response from Kapow about these two clips - so perhaps this is a thing? I don't really know why it needed to happen though!

 

Mine was like that but after transforming it back and forth it seems to have eased a lot of the problem. Currently it's bizarrely locked in pretty tight and I have no idea what I've done differently. it was super loose out of the box.

As a result I was very disappointed and regretted buying Thrust. After transforming him though my opinion changed entirely and I now really like him as the best example of the MP seeker mould although it's still badly dated and needs to be retired after Dirge. I have written an article talking about this figure in quite a bit of depth with the odd joke thrown in (link in my sig below) and here are some pics I took of Thrust  

 

Mine wasn't even *that* loose, but i'm hoping i have the same experience cause otherwise, i'm quite enamoured with this thing.

 

After reading about @Jarrod 's fix, I tried it myself and it's easy! If you're keeping Thrust and comfortable with a soldering iron, I highly recommend it.

My Thrust is now loose waist free