A new LHBS has opened up that I'd like to start buying my grain from (saves on shipping costs, no delays etc.). I don't have a mill, so I have to get them to "mill" it for me when I buy it. Thing is, I don't think he's got a mill either. I think he has some sort of coffee grinder. I've just completed my first all grain batch with some grain I bought precrushed (with a mill) online and it worked great . I've read several posts where people have mentioned a big difference in efficiency with slight adjustments to their mill, so I'm a bit leery about risking a batch crushed with a coffee grinder. Should I be concerned or is this pretty common?