Thanks for the drawing. I still don't know what you meant about CTE line and 1/8 line, but I don't think that matters. Your drawing does clear up one source of confusion for me - I now know that the "1/8 line" isn't CB edge to OB 1/8 but CB 1/8 to OB 1/8, which is just another way to aim CB edge to OB 1/4 (A or C thin cuts).
Thanks again,
pj
chgo