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Take 18
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Lay 19 flat
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Weld 18 with 1" overlap onto center of 19
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Weld 20 to make 1/2" of 19 (cutting knife) exposed at the cutting edge
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Repeat for the total 12 teeth
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Weld 4 teeth at the proper spacing (4" on center ? and 2" on center from edge ? ) to part 15 (tooth bar bolt bar), with X inches overlap between 18 and 15
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Repeat for the 2 other parts 15
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Grind teeth at 45 degree angle with tooth bar weldment in a vice
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Water harden or air harden the teeth by heating to red hot with acetylene torch and then dunking in water
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