Thanks MM, I grew up in a poor household, had it imparted on me early that products lasted a lot longer & ran better if you gave them a tad of TLC - amazing the horrible condition most 2nd hand small engine gear is in.
Spent the arvo with it propped up on one wheel, using drill with wire brush attachment to strip back the underside of the deck - superficial rust but have given it a coat of ruster converter. Will hit it again tomorrow, then lightly wash this back to remove any acid residue. Then pop some primer and paint on it. Doing the same with the blade carrier. Just find such things, make easier long term - though I'm pretty good at washing underside of decks after usage etc.