Tinnerman nut?
Are you sure that you need it? Many of those are put on to retain a shaft during assembly and not needed for operation.
lg
no neat sig line
You almost got it. Those are Tinnerman Palnut Push-Ons.
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Page 26 & 27
http://www.araymondtinnerman.com/industrial/resources/araymond-tinnerman-catalog-industrial-2016.pdf
I call them aggravating.
If everything was made form the same material as those nothing would ever break.
You don't need it, you can remove it and then swap shafts (which you can buy separately) for longer or shorter etc... so you have one ratcheting handle and multiple shafts...