Quoted from brenna98:
I got this rivet punch:
amazon.com link »
I didn't want to buy an expensive press for the Very few times I need to change a target face. Just tap with a hammer.
Great! I had been looking at that tool (a "sash balance rivet setting tool", which doesn't sound_ like it would work, but sure looks about right). I tried to order the official hand-punch from the company that makes the actual rivets, but they recently discontinued the tool, so I was SOL. I ended up having to use a combination of two other punches: A center-punch and a pin-punch, the first to spread the collar of the rivet, and the second to flatten the collar down. That worked, but imperfectly (the collar ended up with some cracks).
I have ordered this tool from Amazon, and will try it out: Thanks for the confirmation!