[Sentai Tamashii]

Ok, so I took out my Knight from the Detolf and was about to take some pictures for you when, wouldn't you know it, that same piece fell out for me as well, but I was able to figure out a way to fix it, albeit making one mistake, but at least you won't have to

My first attempt to reinsert the piece failed, so my second thought was what if I unscrewed the two halves, and then put the piece back and then reassemble? Bad idea, as the jewel on the Dark Wing does not come off, at least not with all the efforts that I've tried, I just ended up with a scratched up jewel

Anyway, here is the fix:

Have the piece face up like a U, and the nub (in the bottom middle) side down, you'll see a little hole in the back part of the Dark Wing body (you'll need a tweezer, thin one preferably), angle the nub into the hole first, and then, use the arm of the tweezer, apply force equally so that both sides slide into place, and done.