Replacement peg for mailbox flag, was missing when we moved in. Modeled in Ondsel / FreeCAD. Worked well enough for now. Might make a hole in the pointy side for a zip tie, to really lock it in.

Print files only provided for PETG, would recommend only PETG/ABS as mailboxes can get toasty. Print a few at the same time in case of failure of the part.