sentence: A representative of the GCN Network is talking and demonstrating how to use tools to fix bike wheels. sentence:  He is standing near an elevated blue bike with several tools displayed on a wall behind him. sentence:  He is using an Allen key to lever the bike tire. sentence:  He rotates the bike tire and then uses the Allen key to adjust the screws. sentence:  Then he resets the pistons of the wheel to realign them. sentence:  Then he precisely fits in the attachment into the wheel.