In my experience, you have more luck using a rattle gun than a spanner. You're after an even twisting force, where as using a spanner means all of the load goes on one side as you're pulling the tool and relying on it to turn to not shear.The offending unit
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Is shockingly crusty in herebut there’s no time for tarting upView attachment 204790
pictures say 1000 words
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But those cheapo ezouts will snap 9 times out of 10. Always worth paying for big boy tools, because when you need them, they rarely let you down.