The metal clip is an aftermarket part that Tomy produced as an Axle retainer for hard racing & crashes, I have a few of them, I dont think they were promoted too much.
The metal clip appeared on most of the Turbo cars I bought new back in the day. I always pulled them off and junked them but they are useful if you plan to race the chassis. Keeping the rear axle from popping is a good idea.
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