On my D50, the camera body has a small pin that sticks out 1.36mm. It's spring loaded, so when the lens (or t-adaptor) clicks into position it stays there. I've never had the problem you describe, but there is some play which I don't like. I have looked everywhere and I can' find a better t-adaptor. I can't find anything that is as good as a genuine Nikon lens.
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