Did you bash it with a hammer?
You have to knock out the expander or wedge that you have screwed in with the allen key. once you've unscrewed it a bit, tap the allen key with a hammer/a piece of wood and you will knock the wedge out, and the stem should come right out.
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Did you bash it with a hammer?
You have to knock out the expander or wedge that you have screwed in with the allen key. once you've unscrewed it a bit, tap the allen key with a hammer/a piece of wood and you will knock the wedge out, and the stem should come right out.