Don,

if Graubner and Zwerger are your primary sources of information on Japanese carpentry, then I can understand why you might be a little askew in your perceptions of Japanese carpentry. Graubner's 'Encyclopedia of Wood Joints' is filled with errors and should not be relied upon as anything other than a general survey.

Anyway, not much interested in engaging further - your argument a few posts back was that draw boring is not done in Japanese traditional construction, and I've shown an example of that very thing and described why I think it is used. I'm sure there are carpenters there who do not employ that technique, just as there are timber framers in other places who do not.

~C