Pusaka, if you are interested in reading about more of these methods pick up a copy of "The Keris and Other Malay Weapons", a compilation of writers put together by MBRAS. You can probably find it new in hardcover for about $15USD. There is an entire chapter in there on ideal keris measurements listing numerous examples from different cultures (Bugis, Brunei, etc.) often at odds with one another. An interesting read though.
