Removing cap from box/turtle style roof vent
After buying a replacement (and replacing the vent), it seems as though indeed these do not come apart (which seems CRAZY to me!). The new one I got does NOT have a mesh on the inside though, so it seems like this particular problem cannot happen again (as there's no "floor" for a nest to rest upon). However, that also means much bigger bugs can enter the shed :). I may add my own mesh on the inside of the roof, which would keep out the bugs but also allow me to remove the mesh to fix a problem like this in the future.