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The gear ratio works from the pinion gear to the sector gear. So "72:1" = 72 pinion gear turns to 1 sector gear turn. Those 200:100 just means it's twice the torque of normal gears (18:1), 300:100 means three times the torque. If you want to pull heavier springs, anything over 20:1 will work fine. The higher the number, the more torque it has. The lower, the faster (Speed gears) the sector gear will be. Hope that helps
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