Lock the cone/locknut on one side tight. On the other side, set the bearing play to slightly tight and lock together the cone/locknut so they are snug but can still move together , then back off the cone until the bearing play is correct, then finish tightening the cone/locknut combo.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1