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B'Twin 500 chain tool.
Why would you want to hold your cassette by 3 teeth on the smallest sprocket when a chain whip can hold all the teeth on the biggest sprocket? Torque is the same (whatever is needed to loosen the lock ring), so holding on the larger radius reduces the tangential force, and spreads it over more teeth.
Is there a tester approved chain whip? What's a good one for not loads of money?