grab a real good flashlight and take a look. It is possible the wedge is wedged against the butting. If that is the case and you can find a willing helper I would try turning the bike over, holding a block of wood in the crook of the stem and bang on that once or twice while the helper holds the bike steady.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk