Sounds like wishful thinking to make it absorb backlash. Its probably viscous as dickens and makes the screws difficult to turn.
If you are trying to reduce the backlash in a standard Acme thread, it would be better to face off one side of the existing nut (or the casting, etc), cut a new thread in a disk that you can fasten to the face of the old nut. Then, shim this disk away from the face of the existing nut until you have reduced the backlash.
Use bearing bronze or aluminum bronze (best but toughest to cut) to make the nut.
Another method involves splitting and then finding a way to collapse the threads of the existing nut, but this the least desirable method because it tends to pull the screw offcenter, especially when you get near the extremes of travel.
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