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Re: needle tatting, when pattern calls for two shuttles
In general, the purpose for two shuttles is to make it possible to throw rings off of chains and/or to do split rings and other more advanced techniques. To throw off a ring when using the needle, all you have to do is get a second needle, use your wrapping thread to make a true ring where the pattern dictates, finish off that ring, and then continue wrapping on your first needle.
If you are making a split ring with the needle, you wrap the first half of the ring normally then unthread the needle and wrap the rest of the ring with the tail thread. Then simply re-thread the needle and continue normally.
With Anne Bruvold's dragons, the reason for two shuttles is the split ring. Just do it like I described above and you should be all right.