Machine shops for the most part won't do anything without customer's approval simply because if they were to the customer can / could deny the charges. And yes I know people that this has happened to.
have you ever had a motor built? your ignorance on this matter is glaring.
don't bother answering because i know it's just gonna be some mealy mouthed half assed "my friend, my dad, people i know, i read that..." kind of response.