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This review is from: Cyclo Chain Link Extractor Adjustable (Sports)
Let's be clear, this is a £4 add-on item - so it's never going to be 'Snap-On' tool quality....that said, you would expect it to do the job. My one did, EVENTUALLY!!
The problem is twofold - the build quality isn't great; consequently, there's a degree of lateral movement in the screw thread (which is less than ideal if you're trying to "thread a needle") and the biggest problem is that the end-stop is symmetrical - so what you ask? This means that when you put the slightly wider chain alongside it's slightly narrower neighbour, the chain sits at a slight angle and the chain link pin then butts up against the end stop rather than being free to pass through it - you can turn the handle until you're blue in the face, but all you'll do it either strip the thread, break the pin...or your wrist!!
Therefore, this item DOES work, but only if you're (1) exceptionally careful in aligning the chain, (2) exceptionally patient (especially if you split the chain in the wrong place - dohh!!!) and (3) built like Arnold Schwarzenegger (or use a screwdriver and a pair of pliers like I did!!).
Buy it, but be warned!!