This is a small change, but one that can turn a ruined piece of crystal stemware into one that can be used and enjoyed.
Below is an example of a rim chip, or a "flea bite" (or here in the South, a "chigger bite"). It's not only unattractive ... it's downright dangerous! I bought a set of beautiful vintage crystal at an estate sale and hated to throw away the ones with flaws. I searched online and found that there are companies that repair chipped crystal by grinding and polishing away the chips.
I also found a company that sells special files for this purpose. I decided to try the ones from beauty supply stores. I bought a variety of "grits." It's the same principle as sanding furniture ... beginning with very gritty and ending up with very fine to achieve a smooth surface.
The glass will never be perfect again. This process just results in a glass that can be used without risk of injury to the user. It causes a slight "dip" where the chip is filed down. A glass like the one below (the pattern is "Caprice" by Cambridge, vintage "Elegant Glass Era" stemware) works well because the pattern helps hide the repair.
Here's how to hold the file. In reality, this is a two-handed job, but I couldn't hold the glass AND take the photograph! I've "improved" a lot of glassware using this method. I've only broken one stem, and that was one of the very first I undertook. You'll learn by doing how hard to press. It takes a fair amount of elbow grease in the first stage. I always keep the rim of the glass wet while I'm filing ... it seems to help the process along.
Here it is below ... almost finished. Note the glass dust mixed with water running down the side of the glass.
And here it is (lower left) ready for use in my next tablescape. This is a sneak preview!
I hope that was helpful. Let me know if you have suggestions or comments!