I had the same problem and ended up taking the problem leg to a mechanic who used an air gun with the appropriate bit on the bolt and it came out straight away. I've done similar in the past with an electric drill on high speed and a spare Allen key that I hacksawed off to make a straight bit for the drill. I think its the initial force of the drill turning that catches the bolt which frees it so there's no point in keeping it spinning.
I know that others have jammed a tapered piece of wood down the tube to stop the internals from moving but this didn't work for me.
I got pretty frustrated with it as I don't like being bested by a chunk of metal but as it took literally seconds for the mechanic to undo he didn't want any money from me and by that point I just wanted to get the job done.
I know that others have jammed a tapered piece of wood down the tube to stop the internals from moving but this didn't work for me.
I got pretty frustrated with it as I don't like being bested by a chunk of metal but as it took literally seconds for the mechanic to undo he didn't want any money from me and by that point I just wanted to get the job done.