Well, common sense says you want to heat the thing on the outside, but that's not always possible. In your case I assume you can easily heat the collar without heating the shaft. But if you were trying to free up a bolt tapped into an engine block, it's nearly impossible to get the block hot enough to release the bolt. In these cases, heating the inner part (the bolt) works surprisingly well. Heat does more than just expand the parts; it also breaks up corrosion and changes the coefficient of friction between the seized parts.
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