Just received my 2600M. I was surprised / not surprised by the “flight case.” There are plenty of comments here, on MW and youtube calling it a good, robust, well built suitcase. I can only assume those commenters have never experienced commercial air travel.
The case is your basic injection molded clamshell case with four spinner wheels. The wheels and casters a nice and chunky, but the “structure” of the case is the plastic shell, which feels just like the ~$20 cheap luggage you can buy at discount outlets around the world. Worse, the zipper is secured to the shell by a single line of stitching.
My wife has a similar case for travel, and hers burst part of the stitching on its first flight. After that, she stabilized the case with a strap.
I’ll hang on to the case for resale value and home storage. If I ever need to ship the 2600 anywhere, it will go into the case, the case will be strapped, and then the case will be packed inside another box. I absolutely would not trust the included case for shipping!
My expectations were low - as far as I can tell, only soft luggage is still built with an internal frame, so that’s what I use for travel. The “hard” shell cases have the structural integrity of a milk bottle, but often with thinner walls.
Incidentally, the jacks require relatively little pressure to insert or remove patch cables, so the plastic nut issue is probably a non-issue.