I have an older Craftsman grinder that I bought back in the early 90s. Mainly Used it with a wire brush to remove old paint and rust from trunk floors. Anyway, the wire brush is still attached. Went out to put my grinder wheel on and I couldn’t find my spanner. Looked everywhere and can’t be found. So, I decided to get another one and I find out none to be had. A regular wrench won’t work. Anyone have any ideas whereI can get a spanner? It’s a 3/4 inch nut.