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When trying to disassemble the gears of a Campagnolo 11S carbon crankset, the torx wrench doesn't fit in the screw on the pedal crank. Is a special wrench needed, and where can you buy it?

In the latest generation of cranksets, an anti-tampering insert has been applied to the central screw of the pedal crank. If you need to open the screw, you have to break it. Once it's broken, you can insert the torx wrench that is commercially available.

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