'86 Carrera mystery part

[ScottG]

I had fun pushing my car to the limit at my region's car control clinic. During the slalom course, I heard something rolling around behind me and then it ended up under my feet. It's about the same size as the cigarette lighter, but I have no idea what it is. Any ideas?

Thanks!

[TargaTony]

Wheel lock

[kbruz]

Wheel lock. The plastic cap on the end pops off.

[ScottG]

thank you, both.