I was just balancing a well known maker's 22x10 prop. I know to sand the back of the blades to get it right in that axis. What about causing a dynamic imbalance? After the blades are in balance the hub may be heavy on one side of the other. On the prop I was just messing with it was way off. The amount is equal to an inch of lead solder on the hub. I have seen instructions that say to use velcro and CA. Frankly that is really ugly may come off. So, on full sized they are balanced with lead put in holes drilled in the hub then secured with epoxy. The lead is installed on the same axis as the crank shaft, not radially. So, what is wrong with doing it that way on our props? The hole needed around 3/32 of an inch. It seems to me that a tiny hole like that that is subsequently filled with epoxy could not compramise the srength. These holes are much smaller than the ones used to secure a prop that uses multiple small screws instead of one big prop nut. There would only be one or two tiny holes, not , say six, larger ones like are often used to mount props.