Hello all I have been reading this thread and very rarely have anything to say. I have been flying R.C for about 45 years. and have a lot of experience with these small temperamental engines. After seeing the back plate all that metal went some where and you will find out when you think it is fixed. I personally ,and this is just my opinion and am not saying anyone is wrong or has given bad advise. I would take the motor, clean it up and put it on my desk as a paper weight. buy a new OS 15LA and go fly. have a great day.