I had only 32 years of corrosion to deal with and had tremendous success at removing all my engine screws and bolts. Sprayed every screw with a penetrating lube before even thinking about removing it. Using a #3 Phillips bit (of which I've seen different ones) in my cordless drill set on high torque/low speed, lean HARD into it to prevent slip and out they came. Now my bike spent the last four years in a shed, and before that no one knows, but likely not exposed to the elements like some. Perhaps I just got lucky.
T
