Heli gear enforcement ring

RC helicopter was broken for friends and brought to me to have a look on it. I think it has a design issue with the upper cog with plastic housing for the axle with lock screws in it, so it opened up most probably on impact and was running free... I had couple of tries to fix it and ended up printing a wider and stronger reinforcement ring holding M2 screws. I had to adjust the plastic case on the helicopter to make enough space for the reinforcement ring.

It flies well after the fix :)