I do not have ths clutch but jsut read Ron, from Werks, suggestion in another thread.. He said it depends on the traction you can acheive. IE Highest traction should be the light clutch, slight slippage being the medium, and no traction being the heaviest.. Then fine tune the engagement and snap with spring and shoe types..

If you are running one fo Neals mills, then the Light clutch is most likely out of the question, so medium or heavy, then Start at 1.0 springs and adjust from there..