KalamaQuilts, I have a few of the threads with the lock cap on it, I guess I'm not to intelligent as I can't figure out how it works. Could you give me the details. Thanking you in advance for your help if you can.
If I am thinking of the same cap, when you want to secure the thread tail on the spool, you just slide it into the slot (kind of wrap it around) which goes all around underneath the top. It doesn't go in very far, but it will stay in there nicely, and you will have the thread end left hanging out to pull on the next time you need to use that thread.