If you want to twist the doubled wire, use the shown ways. Depending on the thickness of the wire, select the appropriate option: for a slim fit and a makeshift reamer with sewing coil or hand vise watchmaker, and for thicker hand drill.
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At work and in everyday life there is often a need in galvanic power source with a stepped gradation of the EMF (including the symmetric polar voltage). Often this "standard" range:...
