[Steven Donow]

I haven't used those in a drivetrain-but 223's 2011 and 2012 had superstructures that were predominantly made out of 1x1 with those connectors. They're great and easy to work with, especially if you have limited machining capabilities. You can basically make your entire frame with a table saw in one afternoon. Depending on specific application, mounting can be troublesome, but overall not too much of a pain.

2012 we used it on dropdown intake/bridge dropper and I don't think it got super damaged even with just friction fit. It's late so I'll scrounge up some pictures tomorrow.