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The "Engine Alignment Tips" video is part of the boating, sailing tipps category, which contains similar videos like this one.
So I called this guy (some local service) and he seems to very honestly tell me I do not need to do alignment EVER unless I feel vibration. My engine/drive seem to be running butter smooth. He's basically asking me: why do you need alignment? What's wrong?
So is he right? Maybe there is no point whatsoever in doing it?