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Editing Step 19 —

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Pre-tin the exposed wires to add rigidity to them and keep them from fraying when pushing through the PCB through-holes.

Pre-tinning is when you cover or fill wires with solder to improve a solder connection. Be sure that your pre-tin does not have any globs on it, or it will not fit through the PCB through-holes. If necessary, trim the wire so that it will fit through the holes.

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