I'm sure all you longtimers know the value of prop balancing, so I'll direct this primarily to the lesser experienced to our sport/hobby. I myself go back to the very early days of analog RC, even late 60's so prop balancing is not only good, but essential to performance and the life of our very investment we put in the air. The slightest unnecessary vibration (can't get rid of it all) induces frequencies of all the vibration spectrum into our circuitry and airframe. And if you think Yuneec's props are any better than 40 years ago, think again. I just balanced all 10 of my H props and only 2 were actually in balance, only one other was close. All the rest were considerably out. That said, multirotor props can present a new challenge in that the shaft holes, threads, and mounting hole sizes vary wildly from RC propeller aircraft as well as, not to mention various manufacturers of quad to quad, hex, etc. I just purchased the new DuBro Balancer (an excellent inexpensive balancer) last week expecting it to have a cone sizer on the propeller shaft like the old Hightpoint Precision Balancers after which Dubro modeled theirs, which of course is not included. No way the shaft fits or screws on to the larger diameter hole of the H props.So... Easy fix for the H: get some 1/4 inch silicone fuel line (available at any RC hobby shop) and cut a half inch or so and thread it on each end of the balancing rod. I had feet of the stuff in my old RC box, but you may have similar lying around. Then, just press an H prop on to the very end making certain the shaft is at least flush with the other end of the prop. My technique: I first clean and wax all my props then balance each prop using 100 grit paper to remove material from the mid to upper middle underside of the heavy blade. Avoid the tips as much as possible as they already flex considerably under load and I'm not comfortable removing even more material from that last 1/4 inch or so. I also use spray cleaning wax to seal the scratches after balancing, then check one last time. I'm sure any other wax product would work fine, just make sure to remove all excess. Perhaps I'm a bit anal about my balancing regimen, but the less resistance and vibration...the absolute better. Having flown planes, helicopters, ducted fans, and just about everything else with parts that can go round and round, I've grown to loathe vibration.