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There are no obstructions to the roundness of the hole where it meets the casting - what you are seeing that makes it look like that is the fact that the round tube is matching up with a square bulkhead, and the corners of the bulkhead are more recessed, which gives the appearance that the sides are protruding into the bore, but they aren't. It is an optical illusion.

[ ashspecz.com ] [ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
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