Major invents a Clanger finder, but it is not very useful – it always finds the Clanger who is holding it. Major is disappointed – he hadn't thought of that. But Granny comes up with a better suggestion to keep him busy: he could mend their clock, which hasn't worked for some time. Major Clanger has a think, then brightens up immediately. He can do better than that – he will build a new clock, and it will be his best invention ever. But it turns out the others don't agree.