Thanks for the info! What grease do you recommend for the bearings?Not sure if any holes are hidden under the plates or not, but cased upon what can be seen, both the front and rear are set to a center position. You have at least 1 more and 1 less aggressive setting on both gangs.
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There are many ways to increase weight of the disk, all depending upon how much you wish to add and your fab skills. Some have been suggested.
Discing from different directions (90 and 45 degrees) will help to break up soil also.