The 3/8"-drive 7/16" deep socket arrived today. As expected, its diameter is slightly too large to fit in the flange's notch. Not by very much, only a millimeter or so (see side-by-side comparison). A tungsten-carbide drum will grind down the outside circumference in short order. I also need to drill out the structure inside the socket (see photo) so the screwdriver can pass through. Speaking of which, the screwdriver on the left is about the minimum size necessary to hold the stud while the socket tightens the nut. It has to fit though the socket. The small screwdriver on the right is the largest that will fit through the 1/4"-drive socket, the one that LN says "will work." It won't.
