I'm appreciative of somebody who also has OCD writing an article like this detailing how the disorder isn't at all like the stereotype of a neat freak. What's funny is, I myself am actually a terribly messy person with books and papers always strewn about (among clothes not quite in the hamper, &c).
What's interesting to me from a personal history viewpoint is that one of my earliest compulsions also centered around door knobs. However, in my case I had to cover the whole surface area of the knob (hah!) with my hand and yank it shut multiple times (the exact number was arbitrary; merely whatever "felt" right) until I was sufficiently satisfied that the damn door was indeed closed. I still do this when leaving my apartment.
Hell, reading this article and writing this comment has "caused" (ie, compelled me to) do some of my own compulsions multiple times already because just thinking about doing them means I need to. Once I get into my head that I "have" to do X, Y, or Z then it's much harder to ignore than if the trigger (or what have you) came up in everyday life. I hope you HNers learned something so me sitting here in my underpants counting powers of 2 and repeatedly moving my head back and forth like a confused pigeon wasn't totally for naught! :)
EDIT: For those more curious about this topic (all dozen of you) I wrote a short piece on my blog attempting to better illustrate the painful bizarrity of OCD through the vehicle of a fictional dialectic: https://salt.mattwie.se/essays/all-mad.html