For Sale Stronglight Cranks & M525s

Use spacers of some kind - I've used allen keys in the past - to let you grip the flats in a vice. Then whack the end of the crank with a mallet to break the thread free. I've done this several times.
 
Tried. When the Park spanners began to flair open and round off I tried clamping a spanner in the vice to the pedal flats, then I tried using nuts as spacers like you've said. It's going to be a challenge
 
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