Does anybody have a schematic of how to replace a window motor (front driver side) on a 1964 Mercury Montclair? So far, we have about 10 hours invested trying to get it. The window keeps popping off the rollers ( if you can get all three on at the same time). There has to be an easier way or we are doing something wrong and over looking something. I need to get this fixed ASAP ! Thanks !!!!