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if your mowing 2X a year do not expect a small flail with small mule to do the work that would require a
60 plus HP mule with an 8 foot VRSIMO, Loftness, JD, ALAMO, LONG, or other brand flail to do in one pass.
I know KAMAN can replace those bushings with 2 row roller bearings and you will have no issues
other than ordering a new stub shaft.
Lot sizes are between 1/4 acre to 1.5 acres. Not really a good area for large equipment.....