Why do so many unfinished tapestries, cross stitch kits and long stitch kits have the threads started with a knot? The instructions clearly state not to use a knot to start a thread as it makes bumps when the item is framed. Also in some of the above the other end of the thread is just left instead of being threaded through some of the last stitches worked. Most instructions have a drawing of how to start and end each thread.
