[HawgRyder]

If the problem re-appears....you might try the old Harley method.
On harley sprockets...there is a series of tapped holes to put a screw or small bolt into.
The idea being...tighten the big nut...then install the small screw/bolt into the first tapped hole that would prevent the big nut from backing off.
I have even put a small washer under the small screw to bind the big nut better.
Bob