The bolt is out! First I used a wire brush in an angle grinder on the thread protruding from the hub. It was around 0C outside. I tried the bar on the bolt but it would not move in either direction. I applied heat then penetrating oil then more heat then the bar again. It moved tightly in both directions and eventually it went beyond the 80 degrees I achieved yesterday. After half an hour of moving it in both directions it felt slack enough to keep going anticlockwise and out it came. I don't think the protruding thread or the concealed thread was the problem. The shank is corroded along one side. I think the corroded side was at the bottom. Maybe water gets in through the slit in the hub and the bolt shank sits in this water. There was little or no penetrating oil on the shank. Thanks for all your suggestions. Next stage, trying to get the strut out of the hub.
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