Previous Version, production stopped in the end of 2016.
ZHENGK had re-designed the gearbox for ZWL-FP(also as known as JSXXXX-370 series)，in past year.
Because the previous moulds were torn out, and ZHENGK took this opportunity to update the design,
The new gearbox performs a better noise level, and seems more impact than before.
Beside remaining same amounting holes, all gear reduction ratios are remained nearly same as before, more important, evern with 1/189 ratio, ZHENGK use it with all metal gears inside.