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finger_jockey
Dogtemple
Are you going to continue riding it? Only thing I found to get the most stubborn crank arm off was to ride it without the bolt tightened up. Was a square taper crank, the bolt was in but loose and had the bolt cap over it. I felt it come loose and nipped the bolt back up and sorted properly when home. Even so took 6 months of regular riding and last resort.
If you know the feeling when a crank arm is coming loose then might be worth a go.