In my post about extending battery life one of the responders indicated that the stock DJI props are not properly balanced and that balancing them will help provide better flight characteristics and perhaps extend battery life. I went looking at the links for a couple of the products used to balance the props but couldn't figure out how the actual "balancing" is done. I understood that the props would freely rotate around the axis - much like balancing a tire - but what balances them as the kits gave no indication on how that is accomplished? Also have others also felt the need to balance their props? Any advise/gotchas? Thanks for any help!