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@tynan
Wally, go into your local bike shop and ask for a cassette spacer, the sort that sit on a freehub body, most mechanics usually have a box of them sitting around - stick this between the cog and the lock ring so that the lock ring is exerting force on the cog (through the spacer) and not simply running out of threads.
They come in various thicknesses - 4mm, 2.5mm, 1mm are pretty common, get one (or a combination) that is just thicker than the area you need to fill.
If they don't give it to you for free (which most do) it should cost you around 50p - £1.