A friend of mine has been playing with swingweight on his irons and has found that adding weight to the club head has helped him get more consistent center strikes. I tried to sell him on the KE4 Max as an iron where you can easily change the swingweight with the weight screws, but he is convinced that adding/removing weight from the toe of the club would introduce a fade/draw bias.

How much does changing out that screw weight impact the horizontal COG? Would you expect it to introduce a fade/draw bias?