Definatley run the machine with them in!!! Increase in capacity can be 2mph or better. What the idea of the inserts are is to get more material up on the walkers of the machine. The theory of setting up one of these machines is that a well set up machine will throw grain over the walkers before it will throw in over the shoe, which just does not happen in wheat and most other crops on the 95xx_cts machines without inserts. They will always throw over the sieves first (which was imensly annoying when you know it can do better then it was). Hence the need to put the inserts into the concave to make the walkers_rotors "work" to thier capacity and increase the capacity of the machine. Most guys I have seen, will run a full set across the front and then maybe two either edge on the next layer to allow for the extra material comming through on the edges of the feeder house on the larger platforms (30_36ft) CTS guys will just run 2 full sets right across the front of the concave. For exactly the same reason, to get as much material into the rotors and off the sieves. When doing this you also have to keep an eye on the material you are thrashing with the drum, keeping an eye out for cracking, but also unthrashed heads. Open up the concave and speed the drum up as far as you dare. I often run in dry wheat at 3-5 and 7 - 800 rpm on the drum and I rarely go above 1100 on the fan. All you want to do is get the grain out of the head, not pullverise the straw and create more of a load on your sieves. Just think wider and faster to increase capacity. I know it seems insane that you increse capacity by blocking off the seperating area and speeding up the drum, but it does work. It will take time to play with and get your machines setting right using this method, but I personally rarely ever take mine out now, I even harvest edible beans, chickpeas and sunflowers with them in with no detriment to performace or quality at all. Keep in mind though, 96xx machines are wider and have always thrown over the walkers first due to that fact so there may be no benefit in those machines. One last thing, DON'T BUY THE INSERTS GENUIE FROM JOHN DEERE, get them made at your local metal fab shop for a quater of the price, then if your really must, .... buy a can of spray and paint them green. last I checked, a genuine single insert was around the Aus. $80-$90 each!! Cheers Bundy