Whether it’s making banjos or training horses, Kentuckians prefer to do things for themselves. As I’ve written elsewhere, this Appalachian DIY attitude is behind Louisville’s rich history of coffee roasting. The most recent addition to Louisville’s long legacy of roasting is Argo Sons Coffee, a (mostly) wholesale-only micro-roaster run by Matt Argo. Over the last several years Argo Sons has carved out a niche providing coffee for many of Louisville’s most beloved coffee shops, including Please and Thank You and Gralehaus. That influence is beginning to be felt internationally as …