Modded simply means the bowls have been ground down. Every thing mentioned is good. Except the angle is not 90 degrees to throttle shaft. I think the spacer in part threw that off. I will look at shimming the bracket tomorrow. I think the plastic sheaves are binding at closed throttle and making for the hard push. Does this sound like a possibility? I will see if I can get a pic up. But always says my files are too large.