Rounded Screw heads

[Wassy]

HELP!!

I have managed to round one of the heads on my B44.1. It is one of the 4 screws that hold the centre spur gear in place..... one of the inner ones that go into the blue motor/gear mount.

Now I have tried to deremel a grove into the screw to remove but with no luck and its pretty much done...... anyone got any tips!

I have a feeling though it might buggered!

Thanks