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Don't let Merlin Choke - Larger Thread - What size needle?

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When using the heavier threads, I usually increase my needle size. Now for me, that would mean, try the 4.0 size first on some scraps. I usually use a 3.5 so 4.0 would be bigger. If the thread is shredding or breaking, try a 4.5.

You may have to adjust the tension a little, maybe looser. Are you using the same thread in the bobbin. If so, check the tension in the bobbin case. I don't ususally use the heavier thread in the bobbin. I would use a regular weight thread for the bobbin.

Have fun.

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