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The bolts should be splined and driven into the hub, from the rear. Purpose of the spline is to keep them from spinning when you take the nut off. On these tractors, the proper length bolt causes the big fat nut to be right at the end of the bolt when properly torqued after installing the wheel.
The spindle should be a tight fit to within a few thousands. You are probably suffering from what most of us old iron folks suffer from and that's worn out machines.
Fix is new spindle bushings and if you are mechanically challenged, or lacking metal working machinery, a reputable machine shop is in order. Go to your NH dealer and get spindle bushings (upper and lower). Remove wheel and hub assy by removing the hub nut and removing the whole shootin match, bearings and all. Disconnect the steering arm by completely removing the bolt and prying up on the arm to pull it off the spindle. Penetrating oil, puller, two hammers hitting each side simultaneously, and heat are ways to accomplish this; one or all. There is a woodruff key in the spindle so remove it too and keep handy for reinstallation. Remove the bolts holding the outer front axle to the center piece. If they don't cooperate, torch em off and reinstall with new ones; regular grade 5 bolts are OK. Take all to a machine shop and say..... .."fix it". Should be about $40 each. Mark
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