we have a customer that is a print shop and they run one color on the paper on a press and then go and run the black on the same paper on the riso it starts off printing dead on then after about the 3rd sheet it drops on the page about 2mm. most places wouldnt even notice the small amount it is off however they measure everything that comes out to make sure it is dead on. we have replaced the entire feed and registration on this machine with no change the machine is completely in time and im not sure what else we can do to make this customer happy. the machine only has around 1.3 million on it. any ideas or help would be great ty in advance