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I went ahead and bought one of the bootleg katz eye screens on ebay from some place in China. It arrived after almost a month, in a tiny plastic envelope inside an unprotected mailing envelope. Nice.
Anyway, now it comes to installing it, but of course it didn't come with instructions. After a quick google search I've found instructions for removing the focusing screen on the *ist D series, but the mechanism looks somewhat different on the K100D.
I can see that there is a little metal catch, but after a couple of quick, gentle prods, first with my fingernail and with a toothpick, I can't seem to figure out how it releases.
Any help would be greatly appreciated!