The brake on a small gauge video or audio cassette

Pat Shevlin demonstrates the "brake" on an 8mm video tape cassette. The brake operates on a spring and its two wings engage tiny grooves on the outer edge of the reel. Pulling the brake back releases the reels so they will turn.

Clip by Pat Shevlin (http://ptlp.com/)

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The brake on a small gauge video or audio cassette

How does the brake work on a small gauge video or audio cassette?