Hi Jamie,
That looks like Bronze to me.
So if it's a bronze fitting and a steel bearing, stick it on a baking tray in your wife's nice clean oven with the open end down.
The bronze will expand more than the steel.
When it get's hot the bearing should fall out. ( I hope )
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I used this method for removing the main bearings from my old Triumph motorbikes ( many years ago )
Jim