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Have frozen many a piece to put into other things.  Bearings, bushings, liners, etc.  Freezer is great.  Used to have a spray called "Minus 96" that we used to chill parts.  A heat lamp inside the receiving casting also can help open up the receiving end of the deal.

Welding inside the old part definitely helps remove it.  Had to pull a 36" bearing race out once.  Ran a MIG bead around the inside of it.  Once it cooled, it practically fell out.

Constantly using temperature differential to make things come apart or go together.  Metal moves a LOT when it heats and cools.  Just be sure to use enough, so you don't get stuck half-way in!  That kinda sucks!

These guys are all giving good advice, and on the same specific subject.  I would trust them!

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