Yeah Chris is right, sometimes my fingers go faster than the brain.
(No comments please!)
That bleed screw has a big plastic head on it.
So the bigger the "minus sign" screw driver the better.
My daughter at the age of 10 which was 20 years ago,
when I asked her to get me a phillips, her reply was, is that the plus or minus sign screw driver. It has stuck with me ever since. Just don't bugger the head.
See ya, Ken