I tried the little blue rotary sharpener too, and had no luck-didn't like it. I don't change blades as often as I should (like my machine needles!), usually waiting until the frustration from skipped threads takes over, then I grudgenly replace it. I have a gazillion "used" blades which I keep in empty blade plastic cases marked "USED", hoping someday I find a sharpener that works. I just buy several packs of 5 at Joann's when they are 50% off.