I have one, it has a sort of rasp end to it. I don't like it at all. Out of 4 threads I tried to bury, it broke 3 of them. So instead of a few loops, I now had a ruined project.
I use a thread pick - this one:
http://www.bobbincentral.com/accesso...ad-picker.html and sometimes a needle from the back side and just snag the loose thread and pull the excess to the back. I can usually tell which thread it is by the longer bobbin thread if my bobbin thread is a different color, or seeing the knot in the wrong spot. I hope that makes sense, it makes sense in my head.
