I'm not sure why Logitech puts screw holes on the back of some models making them easy to mount but on others like the C270 they basically put a useless folding tab. What is that even for? To balance the webcam on your monitor and hope it doesn't fall? Anyway, this replaces that part and has a ¼ screw thread on the back to mount it to most tripods or a Neewer arm.

Here's how to remove the useless part on the back of the C270:

1. There are tiny rubber plugs on either end of the attachment on the backside of the camera. Remove the plug on the side the USB wire comes out of.
2. There is a tiny screw behind it. If you don't see a screw you removed the wrong plug. Using the worlds tiniest screw driver take that screw out.
3. Push something the size of the screw in the hole after the screw is out. This will push a plastic rod out the other side.
4. Done! If you're cheap like me keep that plastic rod and use it to mount my adapter on the back of the camera.