[Al Skierkiewicz]

Team CC, what you describe is unusual for these connectors. We have used them for years on our FRC robots without resorting to the locking devices shown above or the other type manufactured by Anderson. Typically the friction alone holds them very tight. It really sounds like the contacts are not fully inserted in the shell. The metal of the contact should almost come out the front of the shell and there should be an audible 'click' when they are inserted properly. Does any part of the metal contact show at the back of the plastic shell?