Yes, those special needles for coverstitch machines have tiny holes, but my coverstitch machine (Elna 444) came with a needle threader that is magic. ......... And is not like any other needle threader on the market. ......And it works great....... Here is the link, picture, and downloadable instructions
http://www.elna.com/en-gw/accessorie...type=12&id=356
Hope this helps because I tried the knot and pull technique and got stopped at the needle hole so no help there.