The small seeds kit did not work for us. When folded up to the top of the sieve duct for normal grains operation, it badly disturbed the airflow to the sieves with a lot of small dust fines and a much worse sample of grain in the bin plus increased losses over the sieves. To prevent this problem re-occurring, we made a removable small seeds blanking kit for the sieve's fan duct, which could be installed and removed in a few minutes through the holes in the side walls and down through the pressure relief slot in the top of the fan duct. However we found that the addition of a high removeable tailings board on the back of the sieves as suggested by NDDan gave just as much ability to retain small seeds as reducing the airflow from the fan by means of a perforated plate small seeds kit. The pasture seeds harvesting machine required a 400HP Cat 3406 to drive it. The big poly V belt driven suction fan took close to 200 of this HP to drive.