Xray,
It's hard to see in the picture, but is there any of the low end screw sticking out or is it broke off flush?? If there is a little sticking out you could try cutting a slot in it so you can use a screwdriver to remove it. One thing I would worry about leaving is that the original screw has a spring on it to keep the vibration of the motor from causing the screw to back out. I'm a bit worried that it might back out in flight.

Ken