You might need a die set Nikster. I can't verify but I think it's 1/2 x 20 maybe? And yes you can taper it but I would use the die if you can get one.
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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