I have now collected 8-9 old hand saws (panel saws). I am documenting my process of restoring them and was curious about everyone else's advice for resharpening. Basically, I want to compare with my notes. What type of file do you use ? How do you get angles correct, keep track of the filed teeth, etc. Any other specific advice? For anyone interested, here is a video on restoring a few hand saws with a rusty saw plate and scratched up handle - all cross cut saws. I think they turn out well.