I have posted on this 15mm nut problem before. The only way to access the nut is to use a very slim 15mm open end wrench behind the pulley .It needs to be exactly the correct length and thickness.
Probably better to remove the entire assembly, replace the pulley+bearing and use red Loctite on the 15mm nut.Let it cure before refitting.
Be careful if you are trying to fit new serp belt. The ultra high quality belts - like Gates may be too stiff to fit when cold. I find the Conti is easier. Whatever brand it must be exactly the correct length. Half an inch too short will not fit. Half an inch too long is sloppy.
Good Luck !
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