Safety interlock key for Worx 40v mower

This is a replacement safety interlock "key" for the Worx WG779-2 cordless mower. I made this for a friend who had broken theirs. Unfortunately, the key is not available as a replacement part.

The "flag" that operates the internal switch had been broken off. Based on the pieces I was sent, I created the model in Fusion 360. I don't know if the indents on the flag are truly necessary or are an artifact of the injection molding process for the original piece. I do not have access to the mower to verify changes to the design (I am in Wisconsin, Mower is in Oregon). They would weaken the flag and if creating one with access to the mower they might be able to be deleted.