Today I decided to perform my first mod 
I took out the sawtooth-bearing rotor of my HBB Gold Mat, and installed more correct gen-like engraved rotor without sawtooth.
The process went smooth. I must say, that the central rotor screw is quite small - and you really need some patience and good eyes to keep it in the right place.
I took out the sawtooth-bearing rotor of my HBB Gold Mat, and installed more correct gen-like engraved rotor without sawtooth.
The process went smooth. I must say, that the central rotor screw is quite small - and you really need some patience and good eyes to keep it in the right place.