Stonfo’s Thread Splitter is easy to use, requires 2 fingers and a thumb, Pull on the collar and the point extends allowing you to split thread. This works best on untwisted/ unwaxed thread. The best thread for doing this is UTC 70 or 140. These will split easily. For big bug fans, try using thicker UTC 210. You can also use silk thread. UNI, Veevus and Gordan Griffiths are hard to split.