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i just stuffed around with a screwdriver for a while, finally got it to come apart.I tried this, but could not get the green cover off the switch assembly. Looks like you need some special tool to squeeze the four prongs that clips it through the body.
So I dunked it in a cup of metho to clean it. That helped for about 10 days, then it failed to start again. Fortunately I live walking distance from a GMH dealer to get a replacement.