Thanks, friend @pfunk! Rear axle is rebuilt and repainted! Springs will be manufactured on the next Thursday. It will be improved springs with helpers of 9cm with 30kg to suffer per circle (that will put wheel on the ground in the corners where they could be from the ground because of the forces. it will also put the wheels about 5cm down when jumping to land safer without major problems while landing. Stronger part of the spring will have 55-60kg per circle with 10cm of work just to suffer impacts better).