I have recently replaced the regulator in my front passenger side window (RHD). The window goes up and down nicely now, however when it reaches either fully open or fully closed the window stops but the mechanism makes a rattling noise, as if it is trying to keep closing as if it is jumping over plastic teeth (if that makes sense). It does stop when I change the direction of travel. I have tried the usual battery disconnect and window re learn process without success. Does anyone know what I might have forgotten to do?