You will need a 1" pipe tap with the about the first 3'8th inch of the leading edge cut off so it doesn't bottom out and some good tapping fluid. You will need to be extremely cautious while doing this as the area you will be chasing will be work hardened from all the heat cycles. 
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1641, 1541, 682 with 18hp command engine and hydraulics from a 782. 1872 with a power angle blade.
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