It's not a roll pin. It's not hollow and it has more than one lengthwise groove. In the daylight with the magnifying glasses, I can see that it appears to be a different piece of metal than the shaft. The shaft is not drilled all the way through so I can't drive it out with a drift punch.
I'm going to get more physical with it. If it breaks, I'll drill it out and replace it with a roll pin.