Lay the lockring over the hub. Starting at the split, insert one side of the split ring into the groove, then keep moving around the ring, inserting it into the groove until you get to the other end of the split. No tools needed, just finger pressure, maybe a rag at the end if its really tight.
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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