Breaking and entering title text

I’ve heard that at some room escapes you have to solve a lock. That’s cute. Let’s see how you do at solving a key.

My key is broken into 8 pieces. When assembled correctly it looks like this:

Countdown Key

To assemble the key, use this tool. You will need to use all 7 of the red pieces and just 1 of the 5 blue pieces.

Which blue piece is required to replicate this image? 

The answer will unlock a clue to my true identity.

To move pieces, use the Select tool. Click on a piece and drag it around the canvas. To rotate, click on a piece to highlight its border, then hover the cursor over the small blue circle on one edge. Click, hold, and drag in a circle to rotate it. Forget it, just watch the video below: