[mreid]

Wow, glad it wasn't worse. Thanks for sharing as we all need to stay focused.

That looks like a loose spinner that came off quickly (as they will with the stress of autocross). In my experience, only a lead hammer lets you know they are truly seated. You can feel and hear it as you whack the spinner it goes from tinney sounding to solid as it reaches the proper torque. You can not tell in the same way with plastic, deadblow, sockets, etc. Also, you need to give each wheel a test whack after each run. You would be surprised how they will loosen. X2 on the purpose of safety wire. If you depend on it to hold the spinner, you are just an accident waiting to happen. Please let us know what you find.