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Nodules on my electroforms

I keep getting a single nodule on the backside of my nickel electroforms. What could be causing this ? The location of the nodule seems consistent.

Jeff Turner
OEM - Charlotte, North Carolina

If the nodule is not on a high current density area it is probably due to a small raised area on the mandrel, possibly a burr of fuzz.

Russell Richter
- Danbury, Connecticut, USA

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