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If you are using lock tight and it still comes off the temperature of the gear is getting to hot. The heat from the engine and the friction pad is causing the lock tight to fail. This happened to me. remount the spur gear and try to get it tighter to the friction pad. Also if you are not running a hole in your body do so. check the temperature of your engine. if you do all three the gear will run cooler and will work great GH makes good products. Some designs are rushed but most work great the spur gear works great.