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I have been using Magic Loops or Magic Thread to hide the ends in the last chain. I tat just a bit loose to allow for the threads which will be hidden beside the core thread. I start one loop before the other so they end in alternate spots.
I am using some thin strong nylon beading thread which I had on a large cone but the cone is too big to travel with my tatting so I repurposed an empty floss container to hold some spare magic thread.
Just open up the container and wrap your thread around the little spool inside, You even have a cute little cutter, good enough for this thread. I never had much success until I found the right thread to use.
I find challenges in each bit of tatting I do, and its the learning and complexity that draws me in. Just as Knitting or Crochet is not for everyone, neither is tatting.
At the end of these arches I will be giving this monster a slight block on the foam and I will show you the big picture again.