How to remove seized cross bar on a rotary cutter (bush / brush hog)

Removing a cross bar that holds the rotary cutter blades off the vertical spindle or bottom gear shaft. This is a Woods M5 Dixie Cutter rotary cutter (Brush hog, Bush hog, Brush cutter, etc). This particular model had a cross bar that is pressed onto to the vertical shaft coming out of the bottom of the gear box, and you have to get creative to remove it.
I noticed the replacement cross bars now have a split design on the top of the bar that has bolts to clamp it onto the vertical shaft so the bar itself is no longer pressed on.

Tools used:
4" steel square tubing that was a cutoff section of a commercial light pole that you would find in a parking lot.

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Deep well impact socket that is just slightly smaller than the shaft size, so it doesn't get pressed into the cross bar and get stuck.