My Mark Williams C-clip eliminator always leaked on one side. I pretty much decided it was leaking where the bearing adapter squeezes the backing plate up against the axle flange. The adapter O-ring seals to the backing plate, but nothing seals the backing plate to the axle flange, unless you make a gasket or use sealer of some type. I finally gave up trying to make the leak go away and put Torino ends on this time around. Just make sure all the surfaces are clean and flat. Make sure the backing plate seals to the axle flange (which hopefully is straight). I guess if something is warped, the steel bearing carrier is more likely to pull it straight. I never really thought it was possible the adapter was flexing.
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