The engine is a Novarossi kangaroo, Its very difficult for me to explain the 0.8 spring, a measure the top of the crank to the start of screw, and apply there a Zero point then i measure to the top nut that press the spring and got there my measure, (if you understand me)
I will try the 10mm measure but already burn 2 clutch, so i fear that it will not work.
Thxs