Jesus christ. If you've had 8 of them, don't you think that its not them thats the problem its the way your using them? Copper grease. Get some, and wipe a bit on the pin, if you brake it after that, you should stab yourself in the face with it. And in my experience 74kingz TPAs are wank, even though the threads on the red Magura ones are plastic, they work fine and they run smoothly furthermore, I've never had a problem with one.