old set of forks in a bench vise (on the bike fliped over will work) two pens, markers ect. make a marks on them to gage said wobble by tape, zip tie ect. on the forks next to where the sides of the rim are. it will make marks on the "out" side of wobble. if you have never trued a rim it might take a min but it's free and you'll only get better at it. let me know if it works out for you.
do it with the tire off so you can use a large flathead driver to tighten them at the top