Is the part of the tie-rod end which fits into the steering knuckle a tapered or interference (press) fit?
If so, then support the mating piece of the knuckle with a wood block or jack, insert the tie-rod end into the mounting hole, put a piece of hardwood on top of the tie-rod end and give it a rap with a hammer to press it in and hold it while you turn the nut on (might take a couple of raps, but it should hold fast). I've also seen mechanics slip a tie wrap down through the hole, slip the tie-rod end into the hole and then give it a rap on the top to "seat" it, using the tie wrap as a wedge to hold it in - usually pretty effective.
If it's NOT a press-fit, then try a pair of vise grips up at the top of the threads (there is often a collar there) to get the nut going onto the bolt/shaft, or just give up, get a non-nylock nut, put it on tight and then drill a hole for a cotter pin (although I've never had to do that).
gn
Dr. Skun-Knuckles
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