That's quite correct, and just because you have someone machine your parts doesn't mean they did it correctly, that's where verifying everything after you get the parts back and inventory them. If they ain't right you have it done again if possible or you make them replace the part corrected to your specs they were given. If you don't have the tools to check this and ensure you are getting what you need to balance and blueprint the engine then don't touch it. But for those of us that do don't tell us you can't rebuild an engine without giving a reason, we will think that you don't know what you are talking about. Taking an engine apart and putting it back together isn't rebuilding an engine at best it's an inspection, at worst it's a disaster.
Jeff