The one thing you must never do, is jack on a plain Z section. To this end - do not fail to supervise a tyre shop as they are among the worst at just stuffing in and lifting with a trolley jack. You might also need to make this point at MOT time too. I've seen many Morgans with bent and distorted Z sections over the years.
The Gomog article is right, but very lengthy for understanding the various strong and weak bits.
