Now it is time to cinch the new rivet.
Here you can ideally use a rivet die, or just a regular Transfer Punch.
You can't set a rivet on a wood workbench, you need something metal, like an anvil or the "anvil" on the back of a vise, to hammer against.
Two taps is all it takes, the rivet is very soft metal.
If the target won't spin, you are tight enough (if you leave the target loose, it will wear the hole in the switch leaf, ruining it).
Q: Can't I just use a Pop Rivet Gun?
A: No. Although Pop Rivet Guns are great for pinball plastics (Pop metal is softer than regular rivet metal, so less wear on the ball); on targets, they leave a ball of material on the back of the rivet, interfering with the backing foam.
Q: I cinched the rivet down, but there is one little piece of metal standing proud.
A: Just flatten it gently with the hammer.
Q: What is a Transfer Punch?
A: A Transfer Punch fits snugly in a hole, so when you tap it with a hammer, it transfers the exact center of the hole to another surface. Because the tips of the punches are hardened, they work great as an impromptu rivet die.
A complete set of Transfer Punches is $10 at Harbor Freight.