the after market grey 15 tooth gears are tight on the output shaft. Be careful, it is best to lightly sand the ID on the gear so it is not so tight. We had one gear split open as it was pushed on.
I have a new Delco yellow 41 tooth gear, in the box. Yep , they are pricey
Dont worry how old you are... it is the mileage on your body that adds up.