Presuming that you can remove the stem bolt and then remove the stem and its just the wedge that is actually stuck...take it to a framebuilders - they can carefully heat up the steerer tube to get it out (I got Argos in Bristol to do it for me - cost a fiver)
Presuming that you can remove the stem bolt and then remove the stem and its just the wedge that is actually stuck...take it to a framebuilders - they can carefully heat up the steerer tube to get it out (I got Argos in Bristol to do it for me - cost a fiver)