I didn't understand really how is safe way to add neodynamium magnets.
Fill the hole in ferrite magnet with pieces of hard disc magnets in same polarity?

Aniway it working little bit better than sawblade windmill, now down in grass.
This sawblade mill had high rpm. up to 2000 in storm conditions but it killed finally a bearing holder. Less than 2 Years uptime.

Some upgrade for new generator.

But with double rotor it was too heavy and I decided to cut down from 8 meters to 6.
Now it raises easily. New pictures not taken yet.