i say a baisin wrench because she says they have rounded off the stem nut with the wro9ng size socket
a basin wrench uses the flats of the nut and there is a small chance the stem can be removed useing the basin wrench simply because of its long reach that they need and the fact that it indeed uses the flats of the nut for its power
so who been around? its a trick of the trade, something that someone that knows the bumps in the road uses to repair stuff othere have given up on