ok I did the screwdriver test. It indicates that the dizzy should go all the way. The problem is the collor below the drive gear contacts the top of the pump shaft preventing it from going that last 1/4 inch. I see that I can adjust the plate on the dizzy but I'm wondering why when it's all the same except for the pump. My concern would be that the drive gear is not all the way seated and could cause a problem
