In PPC magazine they filled corrosion on the face of an alloy head with JB weld and then gave it a light skim. Apparently it worked. I have some bevel gears from a diff. They have heavy scoring in the hole through the middle where they turn on a shaft which is also damaged. The shaft is cheap to replace but the gears are a bit expensive to get past SHMBO. So I would like to fill the scoring in the bore with JB weld and then ream or hone it out to size. Would this work or would I just be wasting my time? At the narrow end of the gear there is very little spare metal so I am not sure about over boring the hole and fitting a bush. If I did that would bronze be the thing to use?