OK there it is, I posted it. According to the site search, this is the first instance of "inchworm" posted here (or on a number of other train boards for that matter). When I picked up N scale again about a year ago, I knew that I wanted to start out with MTL couplers on everything. I hadn't really mastered the installs on my last attempt many years ago, but I remembered they were the gold standard and started with that in mind. (Back then, there weren't competing knuckle couplers yet, either - how things do change). Anyway, I've been at it making my Inglenook testbed reliable and operable completely hands-off (I needed to rethink magnet positioning before that happened), and it's fully loaded with MTL rolling stock and a switcher. After all my time in the hobby (both years ago, and now for about the last year) I'd never heard a report about a Kadee or MT flaw until I saw something in a video somewhere about a week ago, describing the "inchworm" problem and how it contributes to unwanted uncoupling. I was kind of underwhelmed and didn't even note the link or the site at the time, so I can't quote it. However, the delivery of the message was as if this was a long-known problem that model railroaders have been aware of for a long time (it should be, it's really easy to recreate and see for yourself). I'm still in that mindset where I'm thinking, there must be a fix for that if everyone is so aware of it, and so I started searching. I couldn't find anything. No references, fixes, I mean nothing. Not even the site where I'd just seen the video information for the first time is showing up in my searches. Nothing on this site either. I'm really bummed that I chose the Cadillac of couplers to use universally in my new train world, and they have this glaring flaw. Moreover, I'm freaked out by my inability to find any information about it that doesn't contain an insect ("MT Micro-trains inchworm couplers", etc.) Please let me know what you might already know about this phenomenon or any fixes, even just new sources of information. I'm really stumped on this, not a YouTube video to be found about it. Thanks!