I'm working on this plane:
https://www.towerhobbies.com/cgi-bin...?I=LXETVD&P=ML
I've been having some difficulties balancing it. Sometimes the model balances on the CG and sometimes it doesn't. I suspect that the manufacture may have left something in the tail. I don't currently own a borescope. And I've never used one. That is why I'm asking what borescope should I buy? Do any of you own one? If so what did you buy and how well did it work for you?