Quote Originally Posted by Dennis View Post
Yes you are right about the gauge. Filing can be done with any needle files that have one flat surface, which is all but the round ones.

You have to polish off the teeth along one edge, first on a sharpening stone or diamond plate and then successive sandpapers until very smooth. Ending up with silicone rubber wheels is ideal.

All that remains is to remember to use only the safe side against your stone and gently at that. Dennis.

Awesome. I have a ton of old machinist needle files. I will experiment. Thanks!