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Phil's right; the entire part stays the same shape, just gets bigger. So the hole becomes bigger too. Standard machinist/patternmaker practice.
This also works for freeing up a stuck pressed-in shaft, even though you have to heat the two parts together. The whole assembly gets larger, so the minute gap between the two parts increases also.
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In theory, there is no difference between Theory and Practice. In practice, there is. - Y. Berra
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