John, I use plastic sleeves, I buy the plastic in Indonesia where it is used for food packaging, but cling-wrap works just as well, its just a bit more fiddly to use. Sometimes the keris will sit back in the wrongko, sometimes not, but even if it does, it won't display very well with the plastic sticking out the top of the wrongko. I normally do not display my collection, but I do rotate a couple of keris in blawongs, and these do not have plastic wrap when on display. The very worst way to store a keris is in its wrongko. Rule #1 for storage of ferric material is that you keep it out of contact with cellulose material.
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