A pair of channel-locks is all I have ever used.
Tighten nut while spinning tire to seat the bearings in that fresh new grease.
Back off nut, re-seat the nut snugly while spinning, repeat one or two more times to be sure.
Too tight bad, and too loose bad also, no wobble from end play.
If you set up a dial indicator, most call for not much more than .005" end play to be technical, don't worry on that, just snug it up!
Use a new cotter pin if you have one.
When closing it up, do not totally pack as much grease as will fit.
It needs running room to push the grease away from the bearings' running path.
It is the oil impregnated in the grease that does the lubricating.
If too much grease, meaning filling it, the cap, etc, as much as possible, the grease will churn causing friction within itself.
There has been bearing failures in industrial settings from this (huge pumps, etc.).
Just have a good dollup in there with the bearings packed, leave some air space and you will be fine!
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