Hello - long time lurker first time writer etc.
My current project is remaking a vintage Super DX. I'm not accustomed to these fastener types shown in the image - a nail with a flat end. I can remove that fastener no problem but then what do I do to replace it?
I'm 3D printing new tulip flippers (changing the design a little) so removing the old ones needs to be done.

https://imgur.com/dXDX1SG