Only a product that our team couldn't live without,
JB Weld! It would work great depending on how much force this gear sees. If it isn't too hign then it will work. There isn't any product that will work as a glue under high torques. But JB Weld is the best thing for this situation. We've had to JB Weld our wheels together before and it held very well. Best thing is it sets quick