Hi all, just a follow up to my issues. I have placed it all back together and have driven it for the first time in 10 (ish) years. A new problem has risen (lol). It turns out when you put the blades on, it doesnt engage. But i know where the problem now lays (keyway collar is on the old engine which is on another mower), hopefully im aloud to pull the other one apart to retrieve the other collar (dont think itll be an issue).