I do not know where we got this saw but I took interest in it after we got our first tractor and recognized the name.  The threads on the crank-shaft were all screwed up an flattened and the left-handed fine-threaded nut was missing.  I first got spark and then sat for hours sharpening and cleaning the threads with a thin sharp file.  Once I was confident that they would work I then went to the task of finding that off the wall flywheel nut.  As luck would have it I was searching in a huge bucket of nuts and bolts that we have accumulated and I found the needle in the haystack.  The nut threaded right on and tightened up with no problem.  A little cleaning of the carburetor, gas tank, and fuel line and it was running at my feet.  This saw was truly resurrected.