OK, so say you have an inexpensive antique store find, or even a cheap Wapi for that matter and want to put some file jimps on there for better grip. How would you do it?

Aside form the fact that they are called file jimps, from my attempts at doing some other modifications to my blade, a file doesn't hardly scratch the surfce. That's some quality Sheffield steel in there!

So- dremel cutting wheel to put the jimps in?
bandsaw?
Buy a razor that already has jimps?