Fix it immediately. The problem is most likely the nut on the mainshaft is loose. Remove the OD, tighten the nut (100 ft lbs comes to mind), reinstall OD. Make sure the lock washer is good, and that the tab hasn't broken off of it, or you will need to order another. There are bearings that can be damaged by running with the nut loose.
__________________
Jim Hall
“That man has no respect for his Rover and beats
the hell out of it every opportunity he gets, taking
the most difficult line over each and every
obstacle.” Michael
1966 88" 1.9l VW TDI, GT1749V, IC
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