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Not sure where this info should go, but I'm posting here.
Someone probably thought of this one before, but I'm posting it anyway (since it came to me in a dream ).
A 2" Coupler.
The hammer end.
The seal end.
I did have to take a Dremmel Tool's Sanding Drum to the threads in order for it to fit over the axle's larger splined diameter, but not much.
Under 5 bucks & works like a Champ.