Thanks for the replies, guys...
I've reviewed the Robb Gunther method; looks good to me. I assume my HB has a cast or wrought iron base, and tool steel face/top; does AIA identify if my base is cast or wrought? I can't see any joining line, any idea where the "top" and "base" juncture is? I'm excited to be able to fix this thing up. That missing section is in a bad place!