I've got the wood Kai, and the head on that one is the most unique/different of the Kai lineup. It's got the ridges/depressions in the hollow of the blade holder, and a slight bump at the edge. The spine is noticeably thinner than my DX Woody, but a hair wider than my SS and SR.
The Kai Woody (CAP-RW) may be my best shaver in terms of comfort and ease of use. I wish Kai offered it in the Japanese style, which I am coming to prefer over the folders.
View attachment 1808972
What about this? It is not a Woody versión but the rest is all the same.