ASBC method uses 8" sieves in #10, 14, 18, 30, 60, & 100 mesh sizes plus the pan. It specifies the use of three 5/8" rubber balls (weight not given) on each of the #30, 60, & 100 for a total of nine balls. Sieves are covered and shaken for 5 minutes. Balls are "Screwballs", obtainable from H.R. Williams Mill Supply, Kansas City, MO. Make sure you get a representative sample with the mill at full load. Acceptable grist samples are between 100-130g. Good luck!