Art Thraen taught Dave Hogarth everything he knows, but Art also taught Justin McAllister as well and Justin bought the shop 7 or 8 years ago.
Last year, Justin moved Blackline to Idaho - built an enormous shop and moved his family up. Dave landed on his feet, and while he's got the skills to do Dellorto work, I doubt he's got the tools or the desire anymore.
Justin does them all now. Jake Raby uses him, and they're still doing the same great work they always have.