Correct me if I am wrong, but the "spike" is merely the gripping mechanism of the riveter to pull the "ball" end of the rivet into the "cap" creating a mushroom head that seals the hole and the parts together. Nothing gets driven thru as it is only the black cap end that goes into the hole. Again, the "spike" remains in the riveter as a gripping mechanism..... therefore, a hole IS required for a riveter to function.
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Originally Posted by semtex
Here's a picture of the rivet that comes with the chin spoiler. See how it has a big nail-like spike? That spike is what taps the rivet through the bumper cover. (The spike doesn't stay in the bumper cover, btw. It gets ejected out and then you just toss it out.)
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