Helping a neighbor out with putting the new "clutch" style starter drive on the starter of his 9n. We could not get the shaft gear to retract to the rear of the shaft in order for the straight gear to clear the flywheel ring gear. There was a little movement to the rear but not enough to clear so we took it a part and removed a little "spring cup" mounted in an inner hole and rotating about a hidden groove between the spiral gears on the inner shaft. We decided to take it out. Now the shaft rotates back to where it clears. Was this a mistake. It looked to us that this little "spring" would be chewed up in no time if it allowed the gear to slide all the way back. Did we do the right thing? What does the spring do?