Put the strip of foil between the 2 screws of your corrugators tool, and pinch the 2 screws while pulling the foil through. Be careful to pull very straight so your corrugations don't go diagonal on you.

You may need to run your foil strip a couple times, pinching a little harder to get good corrugations.

Ahh, the Corrugation Tool, It's coming, next page please.

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