A fully pre-assembled retro conversion unit consisting of torque corrector, contra spring and clutch. This component is the most common cause of a broken fan belt. A shortcoming of the converter brands are often advancing from humming while driving or stuttering at start noticeable. The converter only needs to be connected to the gear shaft, the complicated assembly of the back pressure spring canceled. This is a replacement part in standard quality, not for tuned engines. 107 mm