Clamp it in a vise, put a little "heat" to the outer sleeve.
Put a pipe wrench on it and put some pressure on the wrench handle.....then tap or hit on the post [on all different sides] to vibrate it. This should free it up to take it apart.
Heating it up will expand the outer sleeve enough to loosen it up and allow it to break free. If it has a plastic or nylon sleeve inside.....this may ruin it and require replacement.
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