Just replaced a main shaft, and main blades. Still can't find the source of vibration. I began by straightening the old shaft, and when I removed it, I found it was very straight. Decided to get a new main shaft and it was very straight. Only thing I haven't done is balance the new blades.

Anyone have an easy idea for balancing the blades to eachother? Tried placing a Hex wrench though both holes, but no way to balance without the blades swinging on the wrench.

Pictures of homemade balancers would be great.