Originally posted by Mbaez Thanks, I'll look into it.
In my case I plan to use them exclusively on a Sony body.
Loctite 222 (purple) is their light-duty thread locker. You only need a very tiny bit.
You could also use a tiny dab of wax, instead. That won't "lock" the lens to the adapter, but it will add enough resistance to keep it from coming loose accidentally. I'm in manufacturing, and we use a lot of wax-patch fasteners as an alternative to Loctite in places where vibration might otherwise cause screws to come loose.
The adapters for Sony are pretty easy to work with, though. They're big and easy to grab and twist instead of the lens when removing them from the camera.