I bought a pair of these a couple of years ago after I saw them demonstrated at an exhibition. They've been languishing unused in the workshop ever since.... until today, when I was surprised to find that they do not "lock" in any reasonable sense of the word that I understand - despite what I *thought* I saw at the exhibition. After spending an age searching on the Knipex web site, YouTube, and the internet generally I can find virtually nothing on this particular item at all. Has anybody else out there got a pair and if so do they "lock"? Lock that is the manner of a pair of Mole Grips? If so then what I thought I saw at the exhibition was correct and I have a faulty pair. If not then I have completely misunderstood how they are supposed to work.