2-1/8" socket. I could only find local with a 1" drive so I reduced it down to 1/2" for my killer impact driver which I decided to use. NOTE: you will have to grind down the forward end of the socket to fit it down over the hex-nut after you wrestle out the cotter pin. You can see the radius I ground off of it on my 3/4" bench grinder. Have a cup of cold water handy and 'dunk' it often to keep it cool and tempered. Took about 10 mins to shape it.
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