Hmm, the same thing happens to me quite often. My quick troubleshooting seems to indicate that it takes very little to stop the flow out of one side - even having one side rubbing on the sprocket more than the other will do it. The correction each time has been to make sure there is no blockage by using the end of a paperclip, and then setting the oiler to prime to make sure it will flow out both sides, and then turn the tubes so that the are not actually touching the sprocket. Unfortunately over time the tubes seem to bend towards the sprocket for reasons best known to themselves and it happens all over again. Of course it is not completely disasterous and the standard oiler only uses one tube anyway.
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