We learn form mistakes!
It's part of my inquisitive, investigative nature to learn how to properly work things. The 165mm f4 LS was an almost $600 mint investment for me — companion to a camera, back then, that I was unfamiliar with. I researched the 165's modus operandi extensively as it transited from Virginia /USA to Australia making note of the warnings about MLU and LS mode. So when it touched down I was clued up with the right and wrong ways to use it, thus easily avoiding a catrophic repair bill, either of the lens, the 67 body or both! Visit the Pentax forums (pentaxforums.com). I do have a link to the instruction manuals around here somewhere that links to a site download which provides rather grotty photocopies, but clear and pointed text as to operating essentials.