To improve this thread's archival value, here are ATCO's recommendations on just about everything, from how to manage your lawn to how to maintain your mower. (Note: only the 4 stroke 12 and 14" versions are covered.) I had to post this just because it will irritate Deejay, who detests the paper-cutting method of adjusting the reel to bedknife geometry. He may also grit his teeth when he reads all the warnings about not running the mower over foreign objects.
I was also intrigued to learn that the average Britisher mows 30 times during that island's brief growing season. If you follow ATCO's advice and never mow the grass short, I suspect running a roller mower over it that often will indeed help produce rather a nice lawn.
http://www.oldlawnmowerclub.co.uk/sites/default/files/opmanual/Atco%20IB36H.pdf
