Im thinking these parts are pretty generic,and most likely all the same in the size range..........the thread is usually LH,but if you get a matched stock thread and nut,you should have no problem..........unfortunately ,the dealers for these machines are distinctly unhelpful with older "orphans", or waht they havent sold..........the whole oriental machine trade dont seem to realize ,the bad name they have could be greatly improved with a bit of cross brand old machine cooperation........and pooled knowlege.