Thanks for those carb numbers. Now it's a breeze to click and verify springs are there. I did pull up the WT456 and looked at the exploded view. The part number for what I THOUGHT was the return spring (surge diaphragm spring) was one number off from the one you quoted as the spring # in your first reply. Do I have the right spring? It's on the side opposite the diaphragm [that one side vents to ambient, the other side contains the gas one it's way to the tiny venturi orifices]. Sorry, I don't know the proper name for it. Hope that description ID's which side of the carb I'm referring.