pretty sure your little magneto wrench is a GW-1 GilfillanMy close enough attempt at a 1914 tool kit for the T.
It's a rather odd duck. I don't know of any other manufacturer who made one like that, and that piece is NOT included in the WK2 set.I am amazed anyone else knew what it's for. Now I know who the stylized GB logo is. And it bears a GW-1 stamping.