@PhilDAS - I was rather hoping to not have to resort to that. Might try a couple of long soaks with some decent penetrating oil first. Anyone have any experience of plusgas? Seems to be the best option from the research I've done.
If you do go down the chop stem + remove fork route; you can then flip upside down and block the bottom end by tying latex glove, pop in a plastic bucket/containter of some sort and use a funnel to get some caustic soda in the steerer and dissolve what's left of the stem out.
@PhilDAS - I was rather hoping to not have to resort to that. Might try a couple of long soaks with some decent penetrating oil first. Anyone have any experience of plusgas? Seems to be the best option from the research I've done.