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I’ve tried this and it was made of such flimsy metal all of the force went into destroying itself rather than getting the crank off. Eventually the top casting sheered in half.
The crank is still attached.
My conclusion was you won’t get it off without heat. Find an LBS that has a blow lamp and a GBFO hammer.
grams
Tychom
I need to pull off a crank from a bb where the crank extractor thread is toast. I'm thinking of getting some kind of cheap bearing puller from ebay but wondering if people have tried and had success with any particular model.