Champion 4000 Owner's Manual page 15

Assembly Instructions
9. The tamper is designed to be used in either direction. Use the tamper
with its smaller diameter face down when using the greens auger. Use the
tamper with its larger diameter face down when using the grinding auger.
Each face of the tamper is identified as "GRINDING" or "GREENS" on the
handle.
10. The juicer is fully assembled.
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