How do i fix a gear thats broken off inside my Hasbro string launcher?

I recently got my brother the cyclone fury string launcher battle set for his birthday. We have had it for only around 3 days and already something has broken. A gear on the inside has broken off and while i think we can fix it with superglue, I'm worried that might not be the best idea. What should i do?
It's hard but if your careful you cand take apart the launcher and put the pieces back along with the party that fell off you can fix it it won't auto rewind like it did before but it should still be useable if you don't mind the winding the string back manually