if the stem is stuck, sound like the metal bit that grip the inside wedged stuck, screw the bolt back, while leaving a handful of space and then gently try and hit it with a mallet, see if that help.
@edscoble started
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if the stem is stuck, sound like the metal bit that grip the inside wedged stuck, screw the bolt back, while leaving a handful of space and then gently try and hit it with a mallet, see if that help.