I have a .61 size TF P47 with a 20cc gas engine. I fired it up for the first time yesterday and let it idle for about five minutes and the section of the firewall the motor mount screws into partially broke off. Again this happened at idle. The manual says the model can handle a 1.2 four stroke so I was surprised this happened. I roughed all the joining surfaces epoxied the the firewall back together. I really slathered it on. Should I use screws to secure it as well? Below is a picture of the separated panel of the firewall.