agree on it being a T10
I just disassembled my 12GS bar end switch housing and it required a T10 for four little tiny screws. I think that was the first time that I ever used it.
2013 R1200GS K25 (Camhead) Triple Black
2007 F650GS Dakar
“Life is what happens to you while you're busy making other plans.” ― John Lennon