The pushers are held in place by tiny e-clips. You can remove them with a pin but be careful not to lose them as they have a life all their own once they're off the button. Putting the e-clips back on is more of a challenge than removing them, LOL. G-Shock buttons have seals, and you can replace them, but I've never removed the buttons from a DW-3000. I'd imagine they have similar seals.
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