Bumping an old thread with a new favorite pipe nail. I got a 1925 dated railroad/utility nail, my dad's birth year. Using a ball-peen hammer, I worked the end into a spoon, then filed it smooth. Very pleased with the results. The nails are relatively cheap and can be purchased in bulk on Etsy and eBay.
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I was going to ask how you flattened the end. I have a few but didn’t want to mess them up.