I'm learning a lot here. I very naively used all the plastic stuff when I started a few years back. I've had some break but only during installation or in a crash. I've probably made 1000's of flights without a failure.

The plastic ones seem to have less slop since you can press them tightly into the hole.

BTW, I've have had trouble with the metal ones getting loose at the threads. Funny how we have such different opinions about the same things.

Tom