anybody know what this thumb screw thingy is called inside a telescoping two piece ice shelter pole?

I am looking for the "curved nut" inside the bigger of the two rods - that holds the thumb screw in place and allows thumb screw to apply pressure on the inner smaller diameter rod

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flange nut?

I am looking for the "curved nut" inside the bigger of the two rods - that holds the thumb screw in place and allows thumb screw to apply pressure on the inner smaller diameter rod

- - - Updated - - -
flange nut?