Missing tool - or a part from the bumper build

[hockeydad4-22]

Gents,

Will those of you who brought grinders to the bumper build take a look and see if by chance you grabbed an extra spindle nut (I guess that is what it is called, the nut that locks the wheel onto the shaft). We are missing the nut for the red grinder here at the shop.

Obviously, without it, that grinder is not much good. It was not an expensive grinder but we would like to have that part back if anyone has it.

Thanks for checking

Greg