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Grinding Media Agitator: Fabricated steel, double flighted helical screw mounted on a solid steel shaft suspended in the mill body. Agitator shaft and flights are covered with vulcanized rubber. Flight liners are bolt on replaceable castings designed to give maximum life. (Bolt on liners are shipped separate for field installation by others.) Digging shoes (bottom flight liners) are specially designed for ease of replacement, long life and smooth operation. The agitator is attached to the upper drive shaft by a heavy duty keyed and bolted flange.