Leveling or adjusting a platen

Platen Students in my letterpress classes often ask me how to make sure the platen on the presses they buy is adjusted correctly, so that it hits the chasse evenly when they print. I usually point them to a 1985 article from Type and Press. The platen may also need to be adjusted when printing really thick stock (like coasters) or die cutting. The site with the article has disappeared, but I had snagged a copy about a year ago, and I’ve posted it here on my blog.