Use "gear mechanism" in a sentence

1. Praying that nothing would blow in his face, Michel firmly pushed on the opening handle, engaging its gear mechanism, then started turning the wheel

2. She further surprised Pierre in that respect, proving to be incredibly knowledgeable about mechanical sciences and also being highly skilled at mechanical repairs, diagnosing and then repairing a problem with the gear mechanism of the crushing rollers used to crush sugar canes cut down by Pierre’s workers