Hey guys...

First of all, how are you guys normally securing your firewalls on the great planes, flatout series foamies?

Secondly, what do I have to do to get the engine to fit flush against the firewall? The holes all line up, but the large collar that is on the back-side's shaft of the engine does not fit through the pre-drilled holes....This is my first electric, so I wasn't quick to take the collar off, although I don't think its needed? I'm not sure. Thanks in advance for you responses.