A Dremel tool with metal cutting disc is handy for fine work like this. The discs don't last long but I buy them in packs of ten. I find things happen too quickly sometimes with my five inch angle grinder.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone