I have a special section in my shed for tools that are designed to do one annoying and fiddly job really well. There's the fork seal driver, which is exceptionally useful for gently bashing rubber seals into fork boots, and utterly useless for anything else. There's the chain tool, which presses motorcycle chain plates together and peens over the rivets on them, and I'm knackered if I can find anything else it's good for. There's the two-foot torque wrench, which is used exclusively to bludgeon stuck front sprocket bolts and otherwise entirely ornamental.

So here's another single-use tool – one that will be extremely handy for a very small subset of people, but will likely not rise above the threshold of "heh, look at that" for the average home handyman.