A little defensive there, lead balloon. It was a simple question I asked (without mentioning manuals, staying safe and legal or whatever) but I'm not sure from your post whether the answer to my question is:
A lot of those fantastic manuals for simple piston aircraft say the leaning procedure is to lean until the engine 'runs rough' and enrich to remove the roughness.
or something else. Is this what is taught at the course or not? Could you elaborate please?
Actually don't bother, Jabawocky seems to be straight up so I'll wait for him. This isn't the first time supporters of the APS course have, in their hubris, made the course look less attractive to the disinterested observer.