[patoche]

Thanks all

I will go in shop and try to buy few tools , hope i will find to the good size.
I know the tool to remove screw by doing his own notch, but i've always seen large one.
The problem with the brass is friable .
I think it would work if i put the airbrush in vice and hit the tool with hammer, by this way , the tool will get a good grip in the screw, but i'm afraid to kill the airbrush if it doesn't work.
I will try this as a last solution!

pat