In this step, short pieces of copper tape are attached on opposing sides of the active layer. The copper tape is folded over to allow attachment a high voltage amplifier later.
Fixing mistakes from Step 2
If some stray carbon grease found its way outside the active area during Step 2, simply choose that direction to attach the copper tape. Draw an imaginary line from the active area through the mistake and attach a strip of copper tape where that line intersects with the frame. A line of carbon grease will be painted right over the mistake in Step 4, covering it up.
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