In my experience a single smooth solid conductor isn't a problem, or even two if the wires are the same gauge. Once you flow solder multiple strands it's not smooth and consistent diameter. It's irregular shaped and if it's rotates slightly, the soldered wires may twist to a smaller diameter cross section, allowing it to loosen. As a work around, use a crimp ring to secure the wires together along with a short solid wire pigtail that can be secured.
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