Laboratory studies were conducted to determine the feasibility of increasing foreign matter removal by modifying the conveying augers on the stripper heads of cotton strippers. Attachments were welded to the upper or conveying side of the auger flight and were used to agitate the cotton to improve foreign matter separation through the grates under the conveying augers. These attachments were made from 2 sizes of square keystock, 1/4 inches and 3/8 inches, and oriented in 2 directions, perpendicular and parallel to the periphery of the auger. The laboratory setup was a modified auger salvaged from the stripping head of a tractor mounted cotton stripper. The laboratory equipment permitted simulation of conveying augers on tractor mounted strippers in which the augers are 75 inches long as well as self propelled strippers where the conveying augers are 38 inches long. Results of this study indicate the size of the attachments had greater effect on foreign matter removal than did the orientation of attachments. The length of auger had a significant effect on foreign matter removal. The 75 inch auger removed 139% more foreign matter than the 35 inch auger. The 3/8 inch perpendicular attachment in the 75 inch auger removed the greatest amount of foreign matter, 189 lb/a, but also removed the greatest amount of seedcotton, 27.8 lb/a. The 3/8 inch perpendicular attachment tended to choke the auger thus reducing conveying capacity. Fractionation of seed cotton samples collected after conveying revealed that the 3/8 inch parallel mounted attachment resulted in the least amount of residual foreign matter in the seed cotton.