Knowing how critical hot melt glue is in a hackerspace, I’m sure you’ll be relieved that the mystery of why the trigger on the yellow glue gun stopped working has been unravelled, and that it even works again!
There was no hope of getting the gun open until I let it get good and hot to liquify the glue. I was amazed to find the entire front half of the gun full of liquid glue. The great glob of solidified glue in front of the trigger answered the mystery question.
I wonder whether another part was some imagined incident when someone tried to use the gun with the tip badly clogged. With the gun thoroughly heated, he squeezed the trigger again and again, only to have no glue come out. “Where the heck is all the glue going?” he might have wondered.
The gun works again, but no guess as to for how long. The fantastic isopropyl-alcohol-as-hot-melt-release-agent trick cleaned the bench so well that there’s no trace of the huge mess I made.