Found this online, I have however never attempted it.
"Nikon G lenses physically needs the aperture feeler to be holing it in place to stay open. Look for a tab sticking out at the rear of your lens; it should be in a slot and it slides about inch or so. Locate it and move it with your finger check to see if it controls the aperture blades, if so you could lock the aperture at any setting by inserting a small slim made of folded paper or a piece of business card or anything similar that will snugly fit in. Remember it should not be loose so that it slides off and not too tight so that it damages the lens."
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