I think what he wants to know is whether or not the pin-faced screw that secures the wind lever unscrews in the conventional counterclockwise (left-hand) direction. And the answer is: Yes, it does unscrew to the left.
Actually, I don't have a P handy, but I do have a service manual, and that's what it shows. I also checked an Canon 7s, and its screw unscrews to the left, so I'm pretty confident the P does too.
The screw has two holes in it for a pin wrench, but you probably can unscrew it with a sheet of rubber unless it's really stuck.