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Like I said, I have seen at least one person simulate the look by stacking washers of different sizes. In fact, I saw it in the workshop forum here a few weeks ago.

If max says they're one piece, I'd put good money he's right. However, I have seen at least one person duplicate the look by stacking washers. Of course, I've also seen little steel dies for...

Most of what you're looking at is just a big fancy washer made of the same metal as the pins. I've seen several guys do that.