WD40 creates rust.
dun use it 
wash chain ah.....
jack the real wheel up, use kerosense and a brush, and just brush.
turn brush turn brush turn brush.
later use soap water wash the kerosene off, use water wash the soap
off, let the water dry, then apply chain lube.
if you got no o-ring no need wait for water to dry.
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vroom...
pissssssssh...
chik chik...
vrooooooooooooooooooooooom
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