I should have said that the second one's parts are about 8 inches long, and that the third one is also about 8 inches long. That seemed to get lost in my struggle to post it.
Andrew, your first suggestion seems very plausible, but what would be sufficiently novel to justify a patent or a name like OSOEZI.
Eric, good thought, but I think it would be too flimsy to stick in a lawn. I did wonder about a tool for threading something through a tube.
Sea.dog Interesting suggestion, but I'm not sure it's got much of an edge. I'll have to look in the morning.
Russell