[TheTank]

Interesting. Mine slipped right on with a push of the thumb on the top of the arm to get them to slide on. If for some reason they werent sliding on, and the set screw was used to tighten them down onto the shaft, although that seems like its not a lot of pressure, Im pretty sure thats what caused them to fail. They are only very thin aluminum at the top, and loading them in that way, with most likely a gap between the top of the plastic insert, and the top of the servo arm, i would imagine cause that type of failure. If there was no gap between the plastic insert and the arm, the bolt couldnt have pulled through as it appears to have done. As to why the inserts werent seating in the arms completely flush, I am not sure.