That's a good point. They do like to wedge into places.(That's what their trigger is for). That's a good thing to keep in mind when looking over your tank for safety issues. It made me look mine over again! I'm sure the trigger wouldn't be happy if it didn't have at least one place to wedge into. Just because of my own guess, I would have some places that were just the right size, since that's what they're made for. I think this post is partly to see if I'm on the right page with those who know triggers much better than I.
What do you folks think?