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I'm at my wit's end over this crankshaft pulley on my 1940 B. I tried half inch bolts and althread in the crankshaft hole with no luck. I tried a half inch tap to chase the thread and it ate the end of my tap. I tried a 7/16 fine thread tap and it went in fine. I then tried 7/16 althread and it pulled out without getting started. I can't get a half inch fine thread bolt or althread even started into the hole. The threads are not boogered up and I'm officially stuck. Yesterday afternoon I tried grade 5 half-inch course thread, both bolts and althread. No luck. This pulley has a hole for a set crew, but nothing in it. If I could find anything between 1/2" inch and 7/16" I would use that, but nobody has such a creature. I put it in the oven at 400 degrees for about an hour last night and it went on a little easier at first, then stopped with about 3/4" left to get it on completely; I used welding gloves rather than run the risk of my wife making me sleep in the barn with this tractor if I used her oven mitts on this thing. I got it on the shaft and lined up with the woodruff key then my dad held a 2x6 block against the pulley and I hit it until I split two pieces of 2x6, and it finally stopped as I said before, with roughly 3/4" left to go. I don't like the idea of hitting it and running the risk of messing up connecting rods or bearings. I admit that I'm no machinist. I don't have any Farmall guys around me that I can call on for advice or even invite over to sit on a bucket and give my advice. Both of my grandfathers were pretty fair machinists, but they've both been gone for years and I have no brothers or cousins in the tractor mechanic business that I can call on for advice. It's just me trying to get this tractor running for our little girls who are expecting daddy to perform a miracle in the barn and make their pretty red tractor that they've been waiting for nearly a year on to be fixed. I am open to any suggestions. And if anyone feels the need to publicly berate me as another member did on another tractor site by telling me that I didn't know what I was doing, that I better just quit, and that I needed to take it to someone who knew what they were doing, then I guess go ahead, too. Thanks in advance and God's Blessings on you all.