Balancing gyro rotor blades is quite easy if you know what causes vibs and how to cure them.
Here flying Granny Genesis G1SA hands off almost from the start and flying from point A to B without touching the stick using only petals.
I have been flying gyros since 1966 and I enjoyed every second with them in the air.
I will post a video with my first Bensen, wooden blades and overhead stick after converting the film.
From all these and all modern gyroplanes, Aviomania Genesis are my favorites
This is the take off of above video clip.
I liked the McCutchen's rotor blades for performance and very easy hand starting them with a light wind. Never used a prerotator on this gyro.