I have read on here several times about guys shimming out the cylinder bars above the concave on the CDF rotors and wondering if someone sells a kit to do this. I am sure it is just 1/4 flat stock with some holes drilled in it, but I would be willing to buy a kit just for the convenience. Also, wouldn't you have to balance the rotor after doing this? If you have done this to your CDF I would like your opinions on if this helped. We only do corn and soybeans and like the CDF on our older R62 without the adjustable separator grate. I have always wondered about the geometry change of shrinking the rotor without changing the curvature of the concave.