I don't really use those pins though, and mostly they just get in the way, IMHO.
Hmmm... well there must a method to your madness.. could you explain.
I have my holders in the camera bag, or a separate container, and when I first got them, even trying to be careful, they must have slightly opened, as I had gotten several light leaks. So I tried zip lock bags... which worked, but didn't care for doing and undoing the bag. Then tried rubber bands.. but the tension on the slide, if not perfect for both sides may also caused light leaks, so I gave that up.
This afternoon, thought of another idea, on two of them, got out a small soldiering iron, and heated the tip into the plastic around the 'L', on both sides, melting the plastic around the metal. Its working, will see for how long.
But still open up for more ideas.
Doesn't seem to be much of a problem for most of you. These guys must have been used allot, but are light tight, just the annoyance of the 'L' spinning around is the only problem.