Number 6 screw is the size with number 32 threads with both a one screw or two hole choke shaft. SM would be 2 screw. Never found the screws less than 1/2 inch long at a hardware. Lowes did have steel ones in a little package and steel lock washers also. If to long shorten them up. 1/4 long will do but IH sometimes used longer screws and put places in the threads sticking through. That keeps screws from coming out and going in the engine. I usually let them come through the choke shaft just a little then put a little cut place in the thread sticking out in case one comes loose. Just enough to swell the threads on each side of the cut. If I need to remove the screws again I just file the cut place down.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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