Send Jeff a e-flightline an e-mail [email protected] he'll know your answers. If I'm not mistaken, if you bend it you get a replacement for free.

It almost sounds as your spur gear might be slipping. Did you assemble the GB yourself and if so, did you use green locktite when pressing on the spur gear? Also, inspect all the teeth on the spur gear and make sure it doesn't wobble.

I ran my first Katana Mini in nose first from about 20 feet and never bent the shaft on my Cobri.