First make sure it's your Powerbook and not the flat surface that is crooked, ie. place your Powerbook on more than three flat surfaces and see if it still wobbles. If so is it because any of the little feet on the bottom are missing? If not and you have a slight wobble, what I did (and only did twice in the year and few months that I've owned my PB) open up the PB so that the screen isn't involved in the following steps, place the culprit corner over the edge of a table top, and push down ever so slightly....not too much just really really carefully untill the wobble is gone. There are lots of threads on this, but for the 12". I would recommend you do a search with 12 wobble to see what you get.
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