I've been balancing props for 35 years... Never had one break from bad balance... If you want the best footage, balanced props are essential. The rod and Dubro method above looks spot on. The biggest problem I have seen so far with the massive influx of user into the "drone" realm is lack of experience with flying things. I do NOT mean that as an attack, but rather as a statement of fact. I just balanced a 24" prop that goes on a 35HP motor with a bit of scotch tape. I ran up the plane about 30 min ago and it made a huge difference. Smooth as silk now. Not worried...
There is a HUGE learning curve that the autonomous nature of a Solo or similar craft masks. There is no substitute for stick time and practice. Get one of these
Inductrix: Blade - #1 By Design Learn to fly the crap out of it. An added bonus is you can have a hoot with it indoors. It'll be the best 80 bucks you'll spend this year. If it saves your Solo ONCE, it's worth 10 times what you paid. Then, kick off the GPS and learn to fly the Solo. Don't let the solo fly you... If you can't fly, you WILL loose your Solo PERIOD. Or worse, hurt someone or something.
Out of balance props will cause jello in your video. Look up gimbal jello on YouTube. It's a problem that has plagued gimbals for years, it's not a Solo thing... It's an ongoing battle...