Use a hammer impact driver ot impact wrench. If the bolt breaks, which I doubt it will, stick a long bolt into the stem hole and drive out the wedge, then intstall with a new bolt.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1