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@TimLeB
The cranks in question are Stronglight swaged directly onto the gears. The bike I'm stripping down is an old Claud Butler majestic, I would like them to come off intact if possible. I bought a standard 14mm extraction tool and tried it out earlier today. Wouldn't budge even with me leaning on a spanner gripping the tool. The whole thing just seemed to get tighter. Not sure if the smaller of the threaded pieces on the tool is possibly too large? Does it all just need more lube?