No need to work down a knot with a pin. No need to dab on fabric glue or fray stop liquid. No need to twist threads into a big upholstery needle. Snip seam thread tails at 2-1/2", slip Hookey™ blade into the serger seam 1/2" or more from seam end, pull thread tails into the seam with hook slightly rotated toward fabric, and unhook the secured thread tails and clip.
