Alex wrote:

This is for swing arm. Very similar to the one on a desk lamp.

For a prototype?... there's always scrounging. Discarded desklamps for example. Go for a long walk on trash night.

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As always, put on rubber gloves, wear eye protection, stand on an electrically insulating mat, dress in old clothes, avoid electrical shock by working with one hand in your pocket, and do it outdoors in a well ventilated area. Lastly, to avoid personal injury, have it done professionally.
- http://www.homemetalshopclub.org