If there's one thing almost guaranteed to give me skinned knuckles, it's removing reluctant rear cassettes. I always find the chain whip wobbles about while pressing on it, then the chain unwraps suddenly when the lockring comes loose. This device caught my eye in Decathlon because it's a chain whip with no chain.
Instead, it's a solid bar with an arrangement of metal pegs. The pegs fit into the gaps between the teeth on the smallest sprocket, then you hold onto the plastic-coated handle. It keeps the cassette steady while you use a standard cassette removal tool to undo the lockring in the middle. It's fitted with 4 sets of pegs correctly spaced for different sprockets: 11, 12, 13 and 14 tooth. In the first couple of uses it's worked very well. It's much firmer and less likely to come loose while you're using it, and stays in place after the lockring comes undone. When you're finished it's a bit fiddly to persuade the tool off again, but that's still a good trade-off I'm willing to put up with.
It looks solid enough (and isn't light!) but time will see how long it lasts. £11.99 in any Decathlon store or online.
* I'm sure someone will be along in a minute to tell me that Maillard invented these in 1923...
Edited to correct a typo
