I think the posters in this thread are talking about different things. Vellus hairs you cant feel. So if you can feel the hair, it's not a vellus hair. If you drag a cotton swab are your skin, and it snags, it's not a vellus hair. Cis-females have vellus hair all over their bodies, just not on their face. Vellus hair for the most part can not be seen or felt, except under the right light and at the right angle.
Vellus hairs are a type of human hair that are fine, short, light-colored or transluscent, and non-pigmented that develop from childhood and are found on most areas of the body. Their growth is not, in contrast to terminal hairs, affected or dictated by hormones. They also lack a sebaceous gland.
Terminal hairs are thicker, sometimes darker (but can be blond, gray, clear), have an attached sebaceous gland and respond to hormones.
If what you are talking about are true vellus hairs, good luck. They are impossible to remove via electorlysis IMHO. There's not a needle made slim enough. Currently, the smallest gauge of electro needle made is F2 at .002 inches or .055 mm in diameter, and even that is too thick to fit inside a vellus hair follicle. Vellus hair follicles are measure in microns... units much smaller than millimeters. Simple physics. Electron microscope and some new ultra-tiny needles I've never heard of not withstanding.